GATE CSE 2021 Set 1 Q1: Possible class size for a 7 : 3 boys-to-girls ratio

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:

Try it: multiple choice: exactly one correct option

Wrong answer costs 1/3 mark in GATE.

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Answer: C (official GATE 2021 final answer key)

Concept used: With a ratio $7 : 3$ the class has $7k$ boys and $3k$ girls, so the total is a multiple of 10.

First step: Check which option is divisible by $7 + 3 = 10$ .

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Source: official GATE 2021 Set 1 CS question paper and final answer key, organised by IIT Bombay. Question paper · Answer key