22crybur 22crybur

02-12-2016
Mathematics

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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?

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wizard123 wizard123

02-12-2016

Set up a proportion
[tex]\frac{boys}{girls} = \frac{4}{7} = \frac{B}{21}[/tex]

Solve for B by multiplying by 21 on both sides
[tex]B = 21*\frac{4}{7} = 12[/tex]

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