8/21 cannot be simplified as there is no common factor to 8 & 21.
It can be expressed as a decimal 0.3809523 (to 7 dps)
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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
8
no. you can not.
36/8 = 9/2
18 + 3 = 21