Official PYQ · 2021Set 1 · Q1MCQ1 mark

GATE CS 2021 Set 1 Q1 — General Aptitude

The ratio of boys to girls in a class is $7$ to $3$ .

Among the options below, an acceptable value for the total number of students in the class is:

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Answer: C

Let the number of boys and girls in the class be $7x$ and $3x$ respectively, where $x$ is a positive integer.

The total number of students in the class is:

\text{Total Students} = 7x + 3x = 10x

Since the number of students must be a positive integer, $x$ must be an integer. This implies that the total number of students must be a multiple of $10$ .

Among the given options, only 50 (Option C) is a multiple of $10$ (where $x = 5$ ).

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Published 10 Oct 2026

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