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The ratio of boys to girls at a movie is 4 font size decreased by 4 : 7. If there are 21​ girls, how many boys are at the​ movie?

The ratio of boys to girls at a movie is 4 font size decreased by 4 : 7. If there are 21​ girls, how many boys are at the​ movie?
Set up a proportionSolve for B by multiplying by 21 on both sides ...

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