Challenge solved

src/demo6.js

@@ -1,13 +1,31 @@
 const getMaxNumber = (numbersArray) => {
   // your code here
+  const maxNumber = numbersArray.reduce(function(count, item) {
+    if(count > item) {
+      return count;
+    }else {
+      return item;
+    }
+  } , 0);
+  return maxNumber;
 }
 
 const getMinNumber = (numbersArray) => {
   // your code here
+  const minNumber = numbersArray.reduce(function(count, item) {
+    if(item < count) {
+      return item;
+    }else {
+      return count;
+    }
+  } , 1);
+  return minNumber;
 }
 
 const getAverage = (numbersArray) => {
   // your code here
+   average = numbersArray.reduce((count, item) =>  (count + item), 0);
+   return average / numbersArray.length;
 }
 
 module.exports = { getMaxNumber, getMinNumber, getAverage };