in a class, the ratio of boys to girls is 3/4. if there are 12 boys in the class, how many girls are there

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Set up a proportion. Let x = the number of girls.

3 / 4 = 12 / x

Cross multiply:

3x = 48

x = 16

3 / 4 = 12 / x

Cross multiply:

3x = 48

x = 16

for every 3 boys there is 4 girls

divide 12 by 3 and the answer is 4

multiply 4 by 4

16 This will be your answer

divide 12 by 3 and the answer is 4

multiply 4 by 4

16 This will be your answer

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