diff --git a/problems/countNumbers.js b/problems/countNumbers.js
index 3a86643..3230ecd 100644
--- a/problems/countNumbers.js
+++ b/problems/countNumbers.js
@@ -12,9 +12,18 @@
  * returns { 99: 2, 11: 1, 12: 1, 13: 1, 58: 1 }
  */
 
-function countNumbers() {
- 
+function countNumbers(arr) {
+    let result ={};
+    for (let i =0; i<arr.length; i++) {
+        if(!result[arr[i]]){
+            result[arr[i]] = 0;
+        }
+        ++result[arr[i]]
+    }
+    
+    return result;
 }
 
 
+
 module.exports = countNumbers
\ No newline at end of file
diff --git a/problems/getCountriesSortedByPopulation.js b/problems/getCountriesSortedByPopulation.js
index 6e73ba8..5cd64e2 100644
--- a/problems/getCountriesSortedByPopulation.js
+++ b/problems/getCountriesSortedByPopulation.js
@@ -10,8 +10,17 @@
 * 
 */
 
-function getCountriesSortedByPopulation() {
+function getCountriesSortedByPopulation(arr) {
+    
+        let sortCriteria = function(a, b) {
+          return a.population > b.population ? -1 : 1;
+        }
+        let sortedArray = arr.sort(sortCriteria);
+        let onlyCountryNames = sortedArray.map(function(el) {
+          return el.country;
+        })
+        return onlyCountryNames;
+      }
 
-}
 
 module.exports = getCountriesSortedByPopulation
diff --git a/problems/isOdd.js b/problems/isOdd.js
index e93efee..266a88c 100644
--- a/problems/isOdd.js
+++ b/problems/isOdd.js
@@ -9,8 +9,11 @@
 * ex: isOdd(75); // true
 */
 
-function isOdd() {
-
+function isOdd(n) {
+    if(n % 2 === 0){
+        return false
+    }
+    return true
 }
 
 module.exports = isOdd
diff --git a/problems/numberOfDigits.js b/problems/numberOfDigits.js
index a90ca53..2d6bf71 100644
--- a/problems/numberOfDigits.js
+++ b/problems/numberOfDigits.js
@@ -7,8 +7,9 @@
 
 */
 
-function numberOfDigits() {
-
+function numberOfDigits(n) {
+let digits = new String(n)
+return digits.length
 }
 
 module.exports = numberOfDigits
diff --git a/problems/removeEvenStrings.js b/problems/removeEvenStrings.js
index b5e8052..4b6ee1f 100644
--- a/problems/removeEvenStrings.js
+++ b/problems/removeEvenStrings.js
@@ -19,8 +19,14 @@
 * returns: []
 */
 
-function removeEvenStrings() {
-
+function removeEvenStrings(arr) {
+    let newArray =[]
+   for (let el of arr){
+       if(el.length %2 !==0){
+           newArray.push(el)
+       }
+   }
+return newArray
 }
 
 module.exports = removeEvenStrings
diff --git a/problems/removeNumbersAtOddIndices.js b/problems/removeNumbersAtOddIndices.js
index 94d03a0..835faa1 100644
--- a/problems/removeNumbersAtOddIndices.js
+++ b/problems/removeNumbersAtOddIndices.js
@@ -10,8 +10,15 @@
 * ex: removeNumbersAtOddIndices([5, 4, 3, 2, 1]);
 * returns: [5, 3, 1]
 */
-function removeNumbersAtOddIndices() {
+function removeNumbersAtOddIndices(arr) {
+        let newArr = [];
+        for(i = 0; i<arr.length; i++) {
+          if(i%2 === 0) {
+            newArr.push(arr[i]);
+          }
+        }
+        return newArr;
+      }
 
-}
 
 module.exports = removeNumbersAtOddIndices
\ No newline at end of file
diff --git a/problems/removeOddNumbers.js b/problems/removeOddNumbers.js
index cbfe4eb..44c65a8 100644
--- a/problems/removeOddNumbers.js
+++ b/problems/removeOddNumbers.js
@@ -14,8 +14,9 @@
 * ex: removeOddNumbers([2, 4, 6])
 * returns: [2, 4, 6]
 */
-function removeOddNumbers() {
-
+function removeOddNumbers(arr) {
+    return arr.filter(el => el %2 ===0)
+    
 }
 
 module.exports = removeOddNumbers
\ No newline at end of file
diff --git a/problems/removeVowels.js b/problems/removeVowels.js
index be7edc6..5b56788 100644
--- a/problems/removeVowels.js
+++ b/problems/removeVowels.js
@@ -14,8 +14,27 @@
 *
 */
 
-function removeVowels() {
+function removeVowels(str) {
+    let output = "";
+    for (let i = 0; i < str.length; i++) {
+     if (
+       str[i] === "a" ||
+       str[i] === "e" ||
+      str[i] === "i" ||
+     str[i] === "o" ||
+     str[i] === "u" ||
+     str[i] === "A" ||
+    str[i] === "E" ||
+   str[i] === "I" ||
+     str[i] === "O" ||
+    str[i] === "U") {
+        str.slice(i, i + 1)
+     } else {
+       output += str[i]
+       }
+    }
+   return output;
+ }
 
-}
 
 module.exports = removeVowels
diff --git a/problems/sevenBoom.js b/problems/sevenBoom.js
index a77a8f9..d084f12 100644
--- a/problems/sevenBoom.js
+++ b/problems/sevenBoom.js
@@ -11,7 +11,20 @@
 * 17 is also replaced with 'BOOM' because it contains a 7.
 */
 
-function sevenBoom() {
+function sevenBoom(n) {
+    let answer = [];
+    for(i = 1; i<=n ; i++) {
+      let digitToString = i.toString();
+      if( i % 7 === 0 ) {
+        answer.push('BOOM');
+      }
+      else if(digitToString.includes('7')) {
+        answer.push('BOOM');
+      } else {
+        answer.push(i);
+      }
+    }
+    return answer;  
 
 }
 
diff --git a/problems/smallest.js b/problems/smallest.js
index 931bf25..2a39c01 100644
--- a/problems/smallest.js
+++ b/problems/smallest.js
@@ -14,8 +14,12 @@
 * returns 1 (does not matter if it is the first or second 1)
 */
 
-function smallest() {
-  
+function smallest(nums) {
+    let smallest =nums[0]
+    for( let i =0; i<= nums.length -1; i++)
+    if (nums[i]< smallest)
+    smallest = nums[i]
+    return smallest
 }
 
 module.exports = smallest