Explanation:
20/28 = (20 ÷ 2) / (28 ÷ 2) = 10/14 = 5/7
15/21 = (15 ÷ 5) / (21 ÷ 5) = 5/7
25/35 = (25 ÷ 5) / (35 ÷ 5) = 5/7
So, 20/28, 15/21, and 25/35 are equivalent to 10/14.
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