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b. 1/3 x 3/4 - 1/3 x 2/5 = 3/12 - 2/15 = 12/60 - 8/60 = 4/60 = 1/15
c. (3/4-2/5)x1/3 = (15/20-8/20)x1/3 = 7/20x1/3 = 7/60
d.2x(1/3x3/4):2/5 = 2x3/12 :2/5 = 3/6:2/5 = 3/6 x 5/2 = 15/12