13:7
2 dollas
They are: 3 and 7
If you mean 21/18 then the equivalent ratio is 7/6
If the question relates to the ratio 21 : 8 compared with 3 : 1 then they are not equal. Dividing both parts of the first ratio by 8 gives 2⅝ : 1. However, 21 : 7 is equivalent to 3 : 1 as division of both parts of the first ratio by 7 gives 3 : 1.
15, 6
90
7:10 = 3.5:5 = 14:20 = 21:30
Multiply both numbers by the same number (not by zero), and you get an equivalent ratio.
14 to 16, 28 to 32, and 21 to 24
1130/930 is an equivalent ratio.
912/1 is one equivalent ratio.