To solve this problem

Correct !!!

To solve this problem:

Substitute all the values into the formula: P = 2L + 2W >>> 100 = 2(30) + 2W

Then complete the multiplication: 100 = 2(30) + 2W >>> 100 = 60 + 2W

Then subtract 60 from both sides: 100 – 60 = 60 + 2W >>> 40 = 2W

Then divide both sides by 2: 40/2 = 2W/2 >>> 20 = W

The answer is: W = 20.