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 in the school?

500
700
800
1000

Correct Answer: 1000

Explanation:

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

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