In a class of 50 students, 40% are girls. If 10% of boys and 20% of girls wear spectacles, how many students wear spectacles? MCQ with Answer and Explanation

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In a class of 50 students, 40% are girls. If 10% of boys and 20% of girls wear spectacles, how many students wear spectacles?

A. 8

B. 6

C. 9

D. 7

Answer: Option D

Solution (By JKSSB Mock Tests)

Boys=30, girls=20. Spectacles: 10% of 30=3, 20% of 20=4, total 7.

This question belongs to: Maths Percentage

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By what percent is 80 less than 100?

A. 10%

B. 25%

C. 15%

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Correct Answer: Option D

Explanation:
Difference = 20, % = (20/100)×100 = 20%.

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Question #2

The population of a town increases by 8% from 25,000. New population is:

A. 26,500

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Correct Answer: Option B

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Question #3

Length +25%, breadth -20%. Change in area:

A. 0%

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Correct Answer: Option A

Explanation:
1.25×0.8 = 1, 0% change.

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