Perimeter of a rectangle is 372 yards. If the length is 99 yards, what is the width? The perimeter P of a rectangle with length l and width w is: 2l + 2w = P We're given P = 372 and l = 99, so we have: 2(99) + 2w = 372 2w + 198 = 372 Step 1: Group constants: We need to group our constants 198 and 372. To do that, we subtract 198 from both sides 2w + 198 - 198 = 372 - 198 Step 2: Cancel 198 on the left side: 2w = 174 Step 3: Divide each side of the equation by 2 2w/2 = 174/2 w = 87