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3 years ago

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

2 answers:

Ket [755]3 years ago

8 0

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

lozanna [386]3 years ago

5 0

$boys:girls=4:7\\\\girls=21\\\\therefore\\\\boys:21=4:7\\\\\frac{boys}{21}=\frac{4}{7}\ \ \ \ \ |cross\ myltiply\\\\7\ boys=4\times21\\\\7boys=84\ \ \ \ \ |divide\ both\ sides\ by\ 7\\\\boys=84:7\\\\\boxed{boys=12}$

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So leave a message at the tone

Cause I can't get to the phone

Only got time for my main thing, main thing

And even if my minuted low, I'll hit up a payphone

Do anything for the main thing, main thing

So leave a message at the tone

Cause I can't get to the phone

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lisov135 [29]

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