The ratio of boys to girls at the movie is 4:7. If there are 21 girls, how many boys are at the movie?

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asked Apr 17, 2015 49.4k views

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the ratio of boys to girls at the movie is 4:7. If there are 21 girls, how many boys are at the movie?

Mathematics
middle-school

Badr Tazi asked

by Badr Tazi

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$7x=21\\ x=3\\\\ 4x=4\cdot3=\boxed{12}$

Khozzy answered Apr 17, 2015

by Khozzy

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$boys:girls=4:7\\\\girls=21\\\\therefore\\\\boys:21=4:7\\\\(boys)/(21)=(4)/(7)\ \ \ \ \ |cross\ myltiply\\\\7\ boys=4*21\\\\7boys=84\ \ \ \ \ |divide\ both\ sides\ by\ 7\\\\boys=84:7\\\\\boxed{boys=12}$

Sambath Prum answered Apr 23, 2015

by Sambath Prum

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The ratio of boys to girls at the movie is 4:7. If there are 21 girls, how many boys are at the movie?

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