They are: 5/7 10/14 15/21 and 20/28
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two fractions are equivalent 21 over 23 = 42/46, 63/69
25/45 is equivalent to: 5/9, 10/18, 15/27, 20/36, 30/54, 35/63, and many more.
270/630 and 2700000/6300000 are equivalent.
equivalent fractions of 3/21 = 6/42, 9/63, 12/84,...
According to an online equivalent fraction calculator: 42/10 : 63/15