math/hurry
posted by Kirk .
The ratio of boys to girls in Mr. Joiner’s class is 5 to 7. If there are 15 boys in the class, how many total
students are in the class?

Ratio of boys : girls = 5:7 or how about 5x : 7x
so 5x = 15
wouldn't there be 5x + 7x or 12x students ?
take it from here. 
5/7=15/x, x=21

dcXC

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Correct answers