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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?

Respuesta :

wizard123
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]