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b.276/1
c. 245/4
d. 420/1
B. 80/9 × 48/5 × 15/4 = 2880/9 = 320
C. 5/8 × 56/9 × 64/7 = 320/9 = 35 5/9
D. 25/7 × 35/6 × 42/5 = 175