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. 80%

C. 78%

D. 70%

Answer: Option C

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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Car value depreciates 15% first year, 13.5% second. Bought for 5,00,000, value after 2 years:

A. 3,62,500

B. 3,67,625

C. 3,75,000

D. 3,70,000

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Correct Answer: Option B

Explanation:
5,00,000×0.85×0.865 = 3,67,625.

This question belongs to: Maths Percentage

Question #2

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In a class of 60 students, 55% are girls. Number of boys is:

A. 27

B. 33

C. 24

D. 30

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Correct Answer: Option A

Explanation:
45% of 60 = 27 boys.

This question belongs to: Maths Percentage

Question #3

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The salary of a person was first increased by 20% and then decreased by 20%. If his original salary was Rs. 5000, what is his final salary?

A. Rs. 4600

B. Rs. 4920

C. Rs. 4800

D. Rs. 4900

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Correct Answer: Option C

Explanation:
5000 × 1.2 × 0.8 = 5000 × 0.96 = 4800.

This question belongs to: Maths Percentage

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