diff --git a/spec/advanced/advanced.spec.js b/spec/advanced/advanced.spec.js
index a377855..d43fe10 100644
--- a/spec/advanced/advanced.spec.js
+++ b/spec/advanced/advanced.spec.js
@@ -5,7 +5,8 @@ const {
   average,
   largest,
   smallest,
-  median
+  median, 
+  nums
 } = require('../../src/advanced/advanced')
 
 describe('advanced', () => {
diff --git a/src/advanced/advanced.js b/src/advanced/advanced.js
index 8b2b193..bc129ba 100644
--- a/src/advanced/advanced.js
+++ b/src/advanced/advanced.js
@@ -5,21 +5,68 @@ const nums = [1, 10, 3, 9, 4, 8, 5, 7, 6, 2, -5, -2, -4, -9] // eslint-disable-l
 // to prove you have done this, set the variable indexOfTen to the iteration index when you find 10
 let hasTen = false
 let indexOfTen = -1
+for(let i = 0; i < nums.length; i++){
+  if (nums[i] === 10){
+    hasTen = true
+    indexOfTen = i
+    break
+  }
+}
 
 // 2. Use a for loop to count how many numbers in the array are divisible by 3
 let divisibleByThreeCount = 0
+for(let i = 0; i < nums.length; i++){
+  if(nums[i] % 3 === 0){
+    divisibleByThreeCount ++
+  }
+}
 
 // 3. use a for loop to find the average of the numbers in the array
 let average = 0
+let sum = 0
+for(let i = 0; i < nums.length; i ++){
+  sum += nums[i]
+}
+average = sum/nums.length
 
 // 4. use a for loop to find the largest number in the array
 let largest = 0
+for(let i = 0; i < nums.length; i ++){
+  if(nums[i] > largest){
+    largest = nums[i]
+  }
+}
 
 // 5. use a for loop to find the smallest number in the array
 let smallest = 100000
+for(let i = 0; i < nums.length; i ++){
+  if(nums[i] < smallest){
+    smallest = nums[i]
+  }
+}
 
 // 6. find the median of the numbers in the array
+//MY COMMENT: here the test provided fails,
+//but i think the median should be 3.5 and not 3, so i will keep it like this
 let median = 0
+for(let i = 1; i < nums.length; i++){ 
+  for(let j = i; j > 0; j--){
+    if(nums[j] < nums[j - 1]){
+      nums[j] = [nums[j-1], nums[j - 1] = nums[j]][0]
+    }
+    else{
+      break
+    }
+  }  
+}
+
+if(nums.length % 2 === 0){
+  median = (nums[nums.length/2 -1] + nums[nums.length/2])/2
+}
+else{
+  median = nums[(nums.length - 1)/2]
+}
+
 
 module.exports = {
   hasTen,
@@ -28,5 +75,6 @@ module.exports = {
   average,
   largest,
   smallest,
-  median
+  median, 
+  nums
 }
diff --git a/src/extensions/nested-loops.js b/src/extensions/nested-loops.js
index 1d0044b..cba4fea 100644
--- a/src/extensions/nested-loops.js
+++ b/src/extensions/nested-loops.js
@@ -10,27 +10,73 @@ const deepThree = []
 
 // 1. Using a for loop from 1 to 10, add the value of the 'loop index' to the array 'simpleOne'
 //    eg [1,2,3...]
-
-// HINT: in the below loop, the statements and block of code needs to be changed
-// HINT: in the below loop, the var i represents the loop index
-// for (let i = 5; i < 7; i++) {
-// Your code here
-// }
+for(let i = START; i <= END; i++){
+  simpleOne.push(i)
+}
 
 // 2. Using nested for loops, add arrays to 'nestedOne' where each array has n copies of the outer 'loop index'
 //    eg [[1],[2,2],...]
+for(let i = START; i <= END; i++){
+  let n_array = []
+  for(let j = 0; j < i; j++){
+    n_array.push(i)
+  }
+  nestedOne.push(n_array)
+}
 
 // 3. As 2, but each array should contain the values from the outer 'loop index' to 1 inclusive. Update array 'nestedTwo'
 //    eg [[1],[2,1],...]
+for(let i = START; i <= END; i++){
+  let countdown_array = []
+  for(let j = i; j > 0; j--){
+    countdown_array.push(j)
+  }
+  nestedTwo.push(countdown_array)
+}
 
 // 4. As 2, but each array should contain arrays from 1 to the outer 'loop index' with the value of the outer 'loop index'. Update array 'deepOne'
 //    eg [[[1]],[[2],[2,2]],...]
+for(let i = START; i <= END; i++){
+  let lenght_i_array = []
+  for(let j = 1; j <= i; j++){
+    let inner_array = []
+    for(let k = 0; k < j; k++){
+      inner_array.push(i)
+    }
+    lenght_i_array.push(inner_array)
+  }
+  deepOne.push(lenght_i_array)
+}
 
 // 5. As 4, update array 'deepTwo' so that the result is:
 //       [[[1]],[[1],[1,2]],...]
+for(let i = START; i <= END; i++){
+  let lenght_i_array = []
+  for(let j = 1; j <= i; j++){
+    let inner_array = []
+    for(let k = 1; k <= j; k++){
+      inner_array.push(k)
+    }
+    lenght_i_array.push(inner_array)
+  }
+  deepTwo.push(lenght_i_array)
+}
 
 // 6. As 5, update the array 'deepThree', but the result should be the average of the sum of the squares of the numbers in each array
 //       [[1],[[1],[2.5]],...]
+for(let i = START; i <= END; i++){
+  let lenght_i_array = []
+  for(let j = 1; j <= i; j++){
+    let inner_array = []
+    let sum = 0
+    for(let k = 1; k <= j; k++){
+      sum += k**2
+    }
+    inner_array.push(sum/j)
+    lenght_i_array.push(inner_array)
+  }
+  deepThree.push(lenght_i_array)
+}
 
 module.exports = {
   START,
diff --git a/src/for-loop-and-arrays.js b/src/for-loop-and-arrays.js
index 6635155..b53db4c 100644
--- a/src/for-loop-and-arrays.js
+++ b/src/for-loop-and-arrays.js
@@ -6,17 +6,32 @@ let word = '' // eslint-disable-line prefer-const
 // TODO: Add code below this line to make the tests pass
 
 // 1. Use a for loop to set the sum variable to the sum of all the values in nums
+for(let i = 0; i < nums.length; i ++){
+  sum += nums[i]
+}
 
 // 2. Use a for loop to populate doubledNums with every value from nums array doubled (i.e [2, 6, 24, etc...])
 const doubledNums = []
+for(let i = 0; i < nums.length; i++){
+  doubledNums.push(nums[i]*2)
+}
 
 // 3. Use a for loop to set word variable equal to all the letters in the letters array combined as a single string
+for(let i = 0; i < letters.length; i++){
+  word += letters[i]
+}
 
 // 4. Use a for loop to populate everySecondNum with every second number from the nums array
 const everySecondNum = []
+for(let i = 1; i < nums.length; i += 2){
+  everySecondNum.push(nums[i])
+}
 
 // 5. Use a for loop to populate numsReversed with the numbers from nums in reverse order
 const numsReversed = []
+for(let i = nums.length -1; i >= 0; i--){
+  numsReversed.push(nums[i])
+}
 
 // do not change below this line
 module.exports = {
diff --git a/src/for-loop-basic.js b/src/for-loop-basic.js
index dc3775a..caa7787 100644
--- a/src/for-loop-basic.js
+++ b/src/for-loop-basic.js
@@ -4,13 +4,24 @@ const evenNums = []
 const countdown = []
 
 // TODO: 1. Write a for loop that adds the numbers 0 to 3 to the numsZeroToThree array
+for(let i = 0; i < 4; i ++){
+  numsZeroToThree.push(i)
+}
 
 // TODO: 2. Write a for loop that adds the numbers 5 to 10 to the numsFiveToTen array
+for(let i = 5; i < 11; i++){
+  numsFiveToTen.push(i)
+}
 
 // TODO: 3. Write a for loop that adds all the even numbers between 0 and 6 (0, 2, 4, 6) to evenNums
+for(let i = 0; i < 7; i += 2){
+  evenNums.push(i)
+}
 
 // TODO: 4. Write a for loop that adds the numbers 3 to 0 (in that order) to the countdown array
-
+for(let i = 3; i >= 0; i--){
+  countdown.push(i)
+}
 // do not change below this line
 module.exports = {
   a: numsZeroToThree,