The ratio of boys to girls in a school is 3:2. If 20% of boys and 25% of girls are adults, what percentage of the total students are non-adults? MCQ with Answer and Explanation

Question

The ratio of boys to girls in a school is 3:2. If 20% of boys and 25% of girls are adults, what percentage of the total students are non-adults?

A. 75%

B. 78%

C. 70%

D. 80%

Answer: Option B

Solution (By JKSSB Mock Tests)

Let boys = 60, girls = 40. Total = 100. Adult boys = 20% of 60 = 12. Adult girls = 25% of 40 = 10. Total adults = 22. Non-adults = 100 - 22 = 78. Percentage = 78%.

This question belongs to: Maths Percentage

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Question #1

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A man sells two articles for Rs. 120 each. On one he gains 20%, and on the other he loses 20%. Find his overall profit or loss percent.

A. 1% loss

B. 2% loss

C. No profit no loss

D. 4% loss

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Correct Answer: Option D

Explanation:
CP1 = 120/1.2=100, CP2=120/0.8=150. Total CP=250, SP=240. Loss=10, %=(10/250)×100=4% loss.

This question belongs to: Maths Percentage

Question #2

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A trader bought articles for Rs. 1200. Ten were damaged, rest sold at Rs. 2 more than CP each, total profit Rs. 60. Number of articles:

A. 80

B. 100

C. 110

D. 90

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Correct Answer: Option B

Explanation:
Let n articles, CP each = 1200/n. Sold (n-10) at (1200/n + 2). Total SP = (n-10)(1200/n +2) = 1260. Solving gives n=100.

This question belongs to: Maths Percentage

Question #3

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The population of a town is 20,000. It increases by 5% annually. What will be the population after 2 years?

A. 22050

B. 22100

C. 22000

D. 21000

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Correct Answer: Option A

Explanation:
Population = 20000 * (1.05)^2 = 20000 * 1.1025 = 22050.

This question belongs to: Maths Percentage

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