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A = 4x7 / 3x5 = 28/15

B = 1x1 / 5x8 = 1/40

C = 4x7 / 5x3 = 28/15

D = 4x4 / 7x3 = 16/21

E = 7x7 /5x5 = 49/25

F =  7x3 /10 = 21/10

G = 1x3x7 / 2x5x4 = 21/40

H = 5x1x8 / 7x3 = 40/21