diff --git a/codewars/7kyu/t-t-t-48-make-a-rectangular-cup-that-has-maximum-volume/koronya.js b/codewars/7kyu/t-t-t-48-make-a-rectangular-cup-that-has-maximum-volume/koronya.js
new file mode 100644
index 000000000..7a36fc9db
--- /dev/null
+++ b/codewars/7kyu/t-t-t-48-make-a-rectangular-cup-that-has-maximum-volume/koronya.js
@@ -0,0 +1,24 @@
+// [JS][7kyu] T.T.T.48: Make a rectangular cup that has maximum volume
+// t-t-t-48-make-a-rectangular-cup-that-has-maximum-volume
+// https://www.codewars.com/kata/57be770e80ee7a06640000cf/train/javascript
+
+const maximumVolume = (n) => {
+  const arr = []
+  let target = n - 2
+  let count = 1
+  while (target > 0) {
+    arr.push(target ** 2 * count)
+    target -= 2
+    count += 1
+  }
+
+  return Math.max(...arr)
+}
+
+maximumVolume(5) === 9
+maximumVolume(6) === 16
+maximumVolume(7) === 25
+maximumVolume(8) === 36
+maximumVolume(9) === 50
+maximumVolume(10) === 72
+maximumVolume(20) === 588