Question 787244
let l = w + 3
P = 2l + 2w
38 = 2(w+3) + 2w
38 = 2w + 6 + 2w
38 = 4w + 6
38 - 6 = 4w
32 = 4w
32/4 = 4w/4
8 = w

check:

38 = 2(8 + 3) + 2(8)
38 = 2(11) + 16
38 = 22 + 16
38 = 38