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Verified answer
W : D = 3 : 5W = 3/5 x D
(W - 6) : (D - 6) = 3 : 7
3(D - 6) = 7(W - 6)
3D - 18 = 7W - 42
3D - 7W = -42 + 18
3D - 7(3/5 x D) = -24
3D -21D/5 = -24
15D - 21D = -120
-6D = -120
D = -120/-6
D = 20
W = 3/5 x 20
W = 12
(W + 4) : (D + 4) = (12 + 4) : (20 + 4)
= 16 : 24
= 2 : 3