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SSC GD 2023 PYQ — Question 60

SSC GD Constable (English) - 24 Jan 2023 - Shift 3 • Quantitative Aptitude • Q60

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In a school, there are 200 students. If the ratio of the number of boys and the number of girls is 9 : 1, then find the mean proportion between the number of boys and that of girls in the school.

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Correct answer: A

Explanation

The correct answer is option 1 i.e. 60.

Mean Proportion of a and b = ab\sqrt{ab}

Explanation:

According to the given question,

Number of boys = 20010×9{200 \over 10} \times 9 = 180

Number of girls = 20010×1{200 \over 10} \times 1 = 20

Now, the mean proportion between the number of boys and girls = 180×20\sqrt{180 \times 20} = 60

Hence, the required answer is 60.