adriannamj11 adriannamj11

27-02-2016
Mathematics

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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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olemakpadu olemakpadu

27-02-2016

girs: boys = 7:5

42 : boys = 7: 5

42 : b = 7 : 5

42 / b = 7 / 5 Cross multiply

b*7 = 42 * 5

7b = 42* 5

b = 42*5/7 = 6*5 = 30

boys that participated are 30.

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