(4/7) / (8/21) = (4/7) x (21/8) = 84/56 = 1 and 1/2
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12/21 x 7/4 = 84/84 = 1
0.6667
(4/6) / (7/13) = 2/3 * (13/7) = 26/21 or 15/21
20/21
There are several possible interpretations of the question:(6/7) / (8/21)6 / [7/(8/21)]6 / [(7/8)/21]et ceteraAssuming it is the first of these, (6/7) / (8/21) = (6/7) * (21/8) = (3/7) * (21/4)= (3/1) * (3/4) = 9/4 or 21/4