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If the ratio of boys to girls in a class is 3 to 4 and there are 42 pupils in the class how many are girls?
Wiki User
∙ 14y ago
boys : girls = 3 : 4 means that there are 3x boys and 4x girls in the class. So we have:
3x + 4x = 42
7x = 42
7x/7 = 42/7
x = 6
3x = 3(6) = 18 (the number of boys)
4x = 4(6) = 24 (the number of girls)
Thus, there are 24 girls in the class.
Wiki User
∙ 14y ago
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