Ratio, Proportion

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In a certain school, the ratio of boys to girls is 7 : 5. If there are 2400 students in the school, then how many girls are there?

500

700

800

1000

Explanation:

Let the number of boys and girls are 7x and 5x, respectively.
Given, total number of students = 2400
⇒ 7x + 5x = 2400 ⇒ 12x = 2400
∴ x = 200
∴ Required number of girls = 5x = 5 × 200 = 1000.

By: Amit Kumar

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