diff --git a/problems/everyOtherLetter.js b/problems/everyOtherLetter.js
index e6172e1..0cf5c1a 100644
--- a/problems/everyOtherLetter.js
+++ b/problems/everyOtherLetter.js
@@ -7,6 +7,14 @@
  *
  */
 
-function everyOtherLetter() {}
+const everyOtherLetter = str => {
+    let newStr = ""
+    for (let i = 0; i < str.length; i++) {
+        if (i % 2 === 0) {
+            newStr += str[i]
+        }
+    }
+    return newStr
+}
 
 module.exports = everyOtherLetter;
diff --git a/problems/howManyTargets.js b/problems/howManyTargets.js
index 5843ec5..e9d0104 100644
--- a/problems/howManyTargets.js
+++ b/problems/howManyTargets.js
@@ -8,6 +8,15 @@
  *
  */
 
-function howManyTargets() {}
+const howManyTargets = (arr, target) => {
+    let count = 0;
+    for (let i = 0; i < arr.length; i++) {
+        const element = arr[i];
+        if (element === target) {
+            count++
+        }
+    }
+    return count
+}
 
 module.exports = howManyTargets;
diff --git a/problems/isDivisibleBy9.js b/problems/isDivisibleBy9.js
index fd20010..a65b9cf 100644
--- a/problems/isDivisibleBy9.js
+++ b/problems/isDivisibleBy9.js
@@ -8,6 +8,8 @@
  *
  */
 
-function isDivisibleBy9() {}
+const isDivisibleBy9 = (num) => {
+    return num % 9 === 0
+}
 
 module.exports = isDivisibleBy9;
diff --git a/problems/letterCount.js b/problems/letterCount.js
index 7684140..c9b38d0 100644
--- a/problems/letterCount.js
+++ b/problems/letterCount.js
@@ -7,6 +7,19 @@
  *
  */
 
-function letterCount() {}
+const letterCount = str => {
+    let newArr = str.toLowerCase().split(" ");
+    let newStr = newArr.join("")
+    let obj = {}
+    for (let i = 0; i < newStr.length; i++) {
+        const element = newStr[i];
+        if (obj[element]) {
+            obj[element]++
+        }  else {
+            obj[element] = 1
+        }
+    }
+    return obj
+}
 
 module.exports = letterCount;
diff --git a/problems/longestWord.js b/problems/longestWord.js
index ebd044b..f0122f8 100644
--- a/problems/longestWord.js
+++ b/problems/longestWord.js
@@ -8,6 +8,16 @@
  * returns "hello"
  */
 
-function longestWord() {}
+const longestWord = words => {
+    let str = ""
+    for (let i = 0; i < words.length; i++) {
+        const element = words[i];
+        if (element.length > str.length) {
+            str = element
+        } 
+    }
+    return str
+}
+
 
 module.exports = longestWord;
diff --git a/problems/numberIncludes0.js b/problems/numberIncludes0.js
index 2d7f12c..57a19e0 100644
--- a/problems/numberIncludes0.js
+++ b/problems/numberIncludes0.js
@@ -8,6 +8,15 @@
  *  
  */
 
-function numberIncludes0() {}
+const numberIncludes0 = num => {
+    let numStr = num.toString()
+    for (let i = 0; i < numStr.length; i++) {
+        const element = numStr[i];
+        if (element === "0") {
+            return true
+        }
+    }
+    return false
+}
 
 module.exports = numberIncludes0;
diff --git a/problems/onlyStringsGreaterThanOrEqualTo5.js b/problems/onlyStringsGreaterThanOrEqualTo5.js
index 3d82b99..77d6639 100644
--- a/problems/onlyStringsGreaterThanOrEqualTo5.js
+++ b/problems/onlyStringsGreaterThanOrEqualTo5.js
@@ -7,6 +7,6 @@
  * returns ["hello", "corey"]
  */
 
-function onlyStringsGreaterThanOrEqualTo5() {}
+const onlyStringsGreaterThanOrEqualTo5 = words => words.filter(el => el.length >= 5)
 
 module.exports = onlyStringsGreaterThanOrEqualTo5;
diff --git a/problems/productOfOddNumbers.js b/problems/productOfOddNumbers.js
index 629f4ed..29e1160 100644
--- a/problems/productOfOddNumbers.js
+++ b/problems/productOfOddNumbers.js
@@ -7,6 +7,20 @@
  * returns 15
  */
 
- function productOfOddNumbers() {}
+ const productOfOddNumbers = (nums) => {
+     let num = 1
+     for (let i = 0; i < nums.length; i++) {
+         if (nums[i] % 2 === 1) {
+             num *= nums[i]
+        } 
+     }
+     if (num === 1) {
+         return 0
+     }
+     return num
+ }
 
- module.exports = productOfOddNumbers
\ No newline at end of file
+ 
+
+ module.exports = productOfOddNumbers
+ 
\ No newline at end of file
diff --git a/problems/sortPeopleByAge.js b/problems/sortPeopleByAge.js
index 31125c7..e728ee3 100644
--- a/problems/sortPeopleByAge.js
+++ b/problems/sortPeopleByAge.js
@@ -17,6 +17,10 @@
 ]
  */
 
-function sortPeopleByAge() {}
+const sortPeopleByAge = (people) => {
+  return people.sort((a,b) => {
+    return a.age - b.age
+  })
+}
 
 module.exports = sortPeopleByAge;
diff --git a/problems/sumOfValuesOfObject.js b/problems/sumOfValuesOfObject.js
index 234b6d5..accbeaf 100644
--- a/problems/sumOfValuesOfObject.js
+++ b/problems/sumOfValuesOfObject.js
@@ -8,6 +8,13 @@
  */
 
 
-function sumOfValuesOfObject(){}
+const sumOfValuesOfObject = (obj) => {
+    let sum = 0
+    let arr = Object.values(obj)
+    for (let i = 0; i < arr.length; i++) {
+        sum += arr[i] 
+    }   
+    return sum 
+}
 
 module.exports = sumOfValuesOfObject;
\ No newline at end of file
diff --git a/problems/thirdLargest.js b/problems/thirdLargest.js
index 3c8ed17..9a49ee1 100644
--- a/problems/thirdLargest.js
+++ b/problems/thirdLargest.js
@@ -7,6 +7,34 @@
  * returns 8
  */
 
-function thirdLargest() {}
+const thirdLargest = (nums) => {
+    let largest = -Infinity
+    let secondLargest = -Infinity
+    let thirdLargest = -Infinity
+
+    for (let i = 0; i < nums.length; i++) {
+        const element = nums[i];
+        if (element > largest) {
+            largest = element
+        }
+    }
+
+    for (let i = 0; i < nums.length; i++) {
+        const element = nums[i]
+        if (element < largest && element > secondLargest) {
+            secondLargest = element
+        }
+    }
+
+    for (let i = 0; i < nums.length; i++) {
+        const element = nums[i]
+        if (element < largest && element < secondLargest && element > thirdLargest) {
+            thirdLargest = element
+        } else if (nums.length < 3) {
+            return null
+        }
+    }
+    return thirdLargest
+}
 
 module.exports = thirdLargest
\ No newline at end of file