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06-01-2016
Mathematics

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The ratio of boys to girls at a middle school is 3:2. If the school has 400 people, how many will be boys?

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DarkBlue DarkBlue

06-01-2016

b+g=400
b/g=3:2 =>b=3/2*g
3/2g+g=400 => 5/2 g=400 => g=2*400/5=2*80=160
b=3/2*160=3*80=240

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06-01-2016

3+2 = 5

400/5 = 80

80 * 3 = 240

240 boys, and 160 girls.

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