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b) 6/7 × 5/8 = 3/7 × 5/4 = 15/28
c)10/15 × 5/12 = 2/3 × 5/12 = 1/3 × 5/6 = 5/18
d)20/21 × 14/25 = 4/3 × 2/5 = 8/15
3/5 × 2/5 = 6/25
b)
6/7 × 5/8 = 3/7 * 5/4 = 15/28
c)
10/15 × 5/12 = 5/3 * 1/6 = 5/18
d)
20/21 × 14/25 = 4/3 * 2/5 = 8/15