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The ratio of girls to boys who participated in the quiz bowl was 7:5. There were 42 girls in the competition. How many boys participated?

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RoboSpectrum
There are 30 boys in the competition. You can find it by first dividing 42 by 7 which is 6, then you multiply 6 by 5 to get 30.
glowingeyes
Alright! To answer this, you need to cross multiply. Before doing that, set up your ratios 

7:5 
42: x 

7x= (5x42) 
7x= 210 
x= 210 / 7 
x= 30 boys