diff --git a/codewars/7kyu/sum-of-array-averages/koronya.js b/codewars/7kyu/sum-of-array-averages/koronya.js
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+// [JS][7kyu] Sum of Array Averages
+// sum-of-array-averages
+// https://www.codewars.com/kata/56d5166ec87df55dbe000063/train/javascript
+
+const getAverage = (arr) => arr.reduce((a, b) => a + b, 0) / arr.length
+const sumAverage = (arr) => Math.floor(arr.reduce((acc, curr) => acc + getAverage(curr), 0))
+
+sumAverage([
+  [3, 4, 1, 3, 5, 1, 4],
+  [21, 54, 33, 21, 77],
+]) === 44
+sumAverage([
+  [-4, 3, -8, -2],
+  [2, 9, 1, -5],
+  [-7, -2, -6, -4],
+]) === -6