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
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
Set up a proportion. Let x = the number of girls.
3 / 4 = 12 / x
Cross multiply:
3x = 48
x = 16
(3)/(4)=(12)/(n)
n = 16