12/21 x 7/4 = 84/84 = 1
(4/7) / (8/21) = (4/7) x (21/8) = 84/56 = 1 and 1/2
4/7 ÷ 12 = 1/21
0.6667
3/7 is.
That would be 21/4, or 5.25.
(4/6) / (7/13) = 2/3 * (13/7) = 26/21 or 15/21
20/21
153/4 x 4/7 = 153/7
3/5 divided by 1/7 is 21/5 or 4 and 1/5
4/7 divided by 3/5 = 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