The ratio of 15 boys to 12 girls can be simplified by finding the greatest common divisor of 15 and 12, which is 3. Dividing both numbers by 3 gives us a ratio of 5 boys to 4 girls. This means for every 5 boys, there are 4 girls in the group.
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7/3 girls to boys.
12 boys, 15 girls The composite numbers bit is irrelevant. b+g=27 g-b=3 add the equations b+g+g-b=27+3 2g=30 g=15
It is any ratio of the form (12*k)/(15*k) where k is a non-zero integer, or a common factor of 12 and 15.
70:2 is one example. It is a ratio of the from 35*k/k where is any non-zero number.
There is no fixed ratio.