diff --git a/Sprint-3/1-key-errors/0.js b/Sprint-3/1-key-errors/0.js
index 653d6f5a0..06fdcc097 100644
--- a/Sprint-3/1-key-errors/0.js
+++ b/Sprint-3/1-key-errors/0.js
@@ -1,13 +1,23 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> write your prediction here :there is a syntax error because string is decleared two tiimes.
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
+//while calling a function capitalise occured a error. The error is occured due to declared of Str two  times.
 
-function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
-  return str;
-}
+// /*function capitalise(str) {
+//   let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+//   return str;
+// }
+// capitalise("Ramesh");*/
 
 // =============> write your explanation here
+// to resolve this error we need to declared a new variable in step 9. after declaring a new variable it runs and give outputs.
+//which first letter is capital and other are remain same.
 // =============> write your new code here
+function capitalise(str) {
+	let ab = `${str[0].toUpperCase()}${str.slice(1)}`;
+	return ab;
+}
+capitalise('ramesh');
+// The correct code is  given above i pass a value ramesh after running this function the output become Ramesh.
diff --git a/Sprint-3/1-key-errors/1.js b/Sprint-3/1-key-errors/1.js
index f2d56151f..854d18a32 100644
--- a/Sprint-3/1-key-errors/1.js
+++ b/Sprint-3/1-key-errors/1.js
@@ -1,20 +1,29 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============> I think when we run the programme it will show the type error because decimal number is reassigning inside the function.
 
 // Try playing computer with the example to work out what is going on
 
-function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
-  const percentage = `${decimalNumber * 100}%`;
+// function convertToPercentage(decimalNumber) {
+//   const decimalNumber = 0.5;
+//   const percentage = `${decimalNumber * 100}%`;
 
-  return percentage;
-}
+//   return percentage;
+// }
 
-console.log(decimalNumber);
+// console.log(decimalNumber);
 
 // =============> write your explanation here
-
+// while running this function is shows SyntaxError because decimal number variable is declared two times which JavaScript does not allow.
+// and in step 15 we need call function name not decimal number.
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+function convertToPercentage(decimalNumber) {
+	const percentage = `${decimalNumber * 100}%`;
+
+	return percentage;
+}
+
+console.log(convertToPercentage(0.5));
+// After solving this the output is 50%.
diff --git a/Sprint-3/1-key-errors/2.js b/Sprint-3/1-key-errors/2.js
index aad57f7cf..b18bb3b75 100644
--- a/Sprint-3/1-key-errors/2.js
+++ b/Sprint-3/1-key-errors/2.js
@@ -1,20 +1,26 @@
-
 // Predict and explain first BEFORE you run any code...
+// It show the reference error cause function not assigned the variable so that, code is stuck.
 
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
 
-function square(3) {
-    return num * num;
-}
+// function square(3) {
+//     return num * num;
+// }
 
 // =============> write the error message here
+// the message is SyntaxError: Unexpected number.
 
 // =============> explain this error message here
+// The error message is occured due to not assigning the variable in function. TO solve this problems we need to assign the num variable in function.
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
+function square(num) {
+	return num * num;
+}
 
-
+console.log(square(3));
+// The output of this programme is 9.
diff --git a/Sprint-3/2-mandatory-debug/0.js b/Sprint-3/2-mandatory-debug/0.js
index b27511b41..c5015927c 100644
--- a/Sprint-3/2-mandatory-debug/0.js
+++ b/Sprint-3/2-mandatory-debug/0.js
@@ -1,14 +1,22 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> write your prediction here : In step six we need to write return type and output become 320.
 
-function multiply(a, b) {
-  console.log(a * b);
-}
+// function multiply(a, b) {
+//   console.log(a * b);
+// }
 
-console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
+// // console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
-// =============> write your explanation here
+// =============> write your explanation
+// There should be return but code is perfectly run without changing the return type instead of console.log in line 6.
 
 // Finally, correct the code to fix the problem
+// In the section there has no output error but console is for getting output in print but in function there should be a return type so that after correcting this code
+// the output become The result of multiplying 10 and 32 is 320.
 //  =============> write your new code here
+function multiply(a, b) {
+	return a * b;
+}
+
+console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
diff --git a/Sprint-3/2-mandatory-debug/1.js b/Sprint-3/2-mandatory-debug/1.js
index 37cedfbcf..91dc0a0d2 100644
--- a/Sprint-3/2-mandatory-debug/1.js
+++ b/Sprint-3/2-mandatory-debug/1.js
@@ -1,13 +1,19 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// As per this question the answer is not defined but answer should be 42.
+// function sum(a, b) {
+//   return;
+//   a + b;
+// }
 
-function sum(a, b) {
-  return;
-  a + b;
-}
-
-console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+// console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
+//In this question return type has no value so we need to put a+b in step 5. The step 5 will be return a+b;.
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+function sum(a, b) {
+	return a + b;
+}
+console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+// After correcting this code we get the exact output 42. Without correction the output is The sum of 10 and 32 is undefined.
diff --git a/Sprint-3/2-mandatory-debug/2.js b/Sprint-3/2-mandatory-debug/2.js
index 57d3f5dc3..6566dbea1 100644
--- a/Sprint-3/2-mandatory-debug/2.js
+++ b/Sprint-3/2-mandatory-debug/2.js
@@ -1,24 +1,39 @@
-// Predict and explain first...
+// Predict and explain first
+// As per the code output should be the last digits of the given number .
 
 // Predict the output of the following code:
 // =============> Write your prediction here
+//
+// The output always be 3 3 3 3 3 3 3 but i thought output should be the last digits.
 
-const num = 103;
+// const num = 103;
 
-function getLastDigit() {
-  return num.toString().slice(-1);
-}
+// function getLastDigit() {
+//   return num.toString().slice(-1);
+// }
 
-console.log(`The last digit of 42 is ${getLastDigit(42)}`);
-console.log(`The last digit of 105 is ${getLastDigit(105)}`);
-console.log(`The last digit of 806 is ${getLastDigit(806)}`);
+// console.log(`The last digit of 42 is ${getLastDigit(42)}`);
+// console.log(`The last digit of 105 is ${getLastDigit(105)}`);
+// console.log(`The last digit of 806 is ${getLastDigit(806)}`);
 
 // Now run the code and compare the output to your prediction
 // =============> write the output here
+// The last digit of 42 is 3
+// The last digit of 105 is 3
+// The last digit of 806 is 3
 // Explain why the output is the way it is
 // =============> write your explanation here
+// In this variable num is constant and there is no any declaration in function name. Due to this reasons result always be 3.
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+function getLastDigit(num) {
+	return num.toString().slice(-1);
+}
+
+console.log(`The last digit of 42 is ${getLastDigit(42)}`);
+console.log(`The last digit of 105 is ${getLastDigit(105)}`);
+console.log(`The last digit of 806 is ${getLastDigit(806)}`);
 
-// This program should tell the user the last digit of each number.
+// This program should tell the user the last digit  each number.
 // Explain why getLastDigit is not working properly - correct the problem
+// To solve this problems we need to write variable in function.
diff --git a/Sprint-3/3-mandatory-implement/1-bmi.js b/Sprint-3/3-mandatory-implement/1-bmi.js
index 58b1085f1..25fc6f5bb 100644
--- a/Sprint-3/3-mandatory-implement/1-bmi.js
+++ b/Sprint-3/3-mandatory-implement/1-bmi.js
@@ -15,5 +15,10 @@
 // It should return a string of their Body Mass Index to 1 decimal place
 
 function calculateBMI(weight, height) {
-  // return the BMI of someone based off their weight and height
+	// return the BMI of someone based off their weight and height
+	let squared_height = height * height;
+	const bmi = weight / squared_height;
+	return bmi.toFixed(1);
 }
+console.log(`The BMi of the person is ${calculateBMI(70, 1.73)}`);
+//  The output of the program is 'The BMi of the person is 23.4'.
diff --git a/Sprint-3/3-mandatory-implement/2-cases.js b/Sprint-3/3-mandatory-implement/2-cases.js
index 5b0ef77ad..9860dc849 100644
--- a/Sprint-3/3-mandatory-implement/2-cases.js
+++ b/Sprint-3/3-mandatory-implement/2-cases.js
@@ -14,3 +14,8 @@
 // You will need to come up with an appropriate name for the function
 // Use the MDN string documentation to help you find a solution
 // This might help https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase
+function toUpperSnakeCase(str) {
+	return str.replaceAll(' ', '_').toUpperCase();
+}
+console.log(toUpperSnakeCase('hello there'));
+//  The output of the given code is HELLO_THERE
diff --git a/Sprint-3/3-mandatory-implement/3-to-pounds.js b/Sprint-3/3-mandatory-implement/3-to-pounds.js
index 10754da73..245af30ad 100644
--- a/Sprint-3/3-mandatory-implement/3-to-pounds.js
+++ b/Sprint-3/3-mandatory-implement/3-to-pounds.js
@@ -4,3 +4,20 @@
 // You will need to declare a function called toPounds with an appropriately named parameter.
 
 // You should call this function a number of times to check it works for different inputs
+function toPounds(penceString) {
+	const penceStringWithoutTrailingP = penceString.substring(
+		0,
+		penceString.length - 1,
+	);
+	const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, '0');
+	const pounds = paddedPenceNumberString.substring(
+		0,
+		paddedPenceNumberString.length - 2,
+	);
+	const pence = paddedPenceNumberString
+		.substring(paddedPenceNumberString.length - 2)
+		.padEnd(2, '0');
+	return `£${pounds}.${pence}`;
+}
+console.log(toPounds('399p'));
+console.log(toPounds('2p'));
diff --git a/Sprint-3/4-mandatory-interpret/time-format.js b/Sprint-3/4-mandatory-interpret/time-format.js
index c0dd9c9a5..f0c47dd6b 100644
--- a/Sprint-3/4-mandatory-interpret/time-format.js
+++ b/Sprint-3/4-mandatory-interpret/time-format.js
@@ -1,19 +1,20 @@
 function pad(num) {
-  let numString = num.toString();
-  while (numString.length < 2) {
-    numString = "0" + numString;
-  }
-  return numString;
+	let numString = num.toString();
+	while (numString.length < 2) {
+		numString = '0' + numString;
+	}
+	return numString;
 }
 
 function formatTimeDisplay(seconds) {
-  const remainingSeconds = seconds % 60;
-  const totalMinutes = (seconds - remainingSeconds) / 60;
-  const remainingMinutes = totalMinutes % 60;
-  const totalHours = (totalMinutes - remainingMinutes) / 60;
+	const remainingSeconds = seconds % 60;
+	const totalMinutes = (seconds - remainingSeconds) / 60;
+	const remainingMinutes = totalMinutes % 60;
+	const totalHours = (totalMinutes - remainingMinutes) / 60;
 
-  return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
+	return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
 }
+console.log(formatTimeDisplay(61));
 
 // You will need to play computer with this example - use the Python Visualiser https://pythontutor.com/visualize.html#mode=edit
 // to help you answer these questions
@@ -22,17 +23,24 @@ function formatTimeDisplay(seconds) {
 
 // a) When formatTimeDisplay is called how many times will pad be called?
 // =============> write your answer here
+// The pad is called 3 times in step 15.
 
 // Call formatTimeDisplay with an input of 61, now answer the following:
 
 // b) What is the value assigned to num when pad is called for the first time?
 // =============> write your answer here
-
+// The value which is assigned to num when pad is called for the first time is 0.
 // c) What is the return value of pad when it is called for the first time?
 // =============> write your answer here
+// The value of pad when it is called for the first time "00"
 
 // d) What is the value assigned to num when pad is called for the last time in this program?  Explain your answer
 // =============> write your answer here
+// The value assign to num is 1.
+//  because the last call to pad is pad(remainingSeconds), and remainingSeconds is 1
+// when formatTimeDisplay(61) is called.
 
 // e) What is the return value of pad when it is called for the last time in this program?  Explain your answer
 // =============> write your answer here
+// The return value is "01" because the last call to pad is pad(1).
+// The pad function add a zero to make the number two digits.