At a country concert, the ratio of the number of boys to the number of girls is 2:7. If there are 250 more girls than boys, how many boys are at the concert?

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asked Aug 23, 2015 75.8k views

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At a country concert, the ratio of the number of boys to the number of girls is 2:7. If there are 250 more girls than boys, how many boys are at the concert?

Mathematics
middle-school

Cong Nguyen asked

by Cong Nguyen

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1 Answer

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$2x-number\ of\ boys\\7x-number\ of\ girls\\\\7x=2x+250\\7x-2x=250\\5x=250\\x=50\\\\2x=2\cdot50=100\\\\There\ are\ 100\ boys\ at\ the\ concert.$

Jonathan Thurft answered Aug 28, 2015

by Jonathan Thurft

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