Exams › SSC CGL (Prelims) › General

In an examination, the average score (out of 100) of boys is 75 and that of girls is 80. If the combined average for all students is 78, what is the ratio of the number of boys to the number of girls?

1. 1 : 3
2. 2 : 3
3. 1 : 2
4. 3 : 4

Correct answer: 2 : 3

Solution

From 75b + 80g = 78(b + g), we get 2g = 3b, so b : g = 2 : 3. The combined average of 78 is closer to the girls' average (80), confirming there are more girls than boys.

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