What is 30% of 30% of 200? MCQ with Answer and Explanation

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What is 30% of 30% of 200?

A. 30

B. 18

C. 20

D. 24

Answer: Option B

Solution (By JKSSB Mock Tests)

0.3 × 0.3 × 200 = 18.

This question belongs to: Maths Percentage

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Question #1

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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. 80%

B. 70%

C. 78%

D. 75%

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Correct Answer: Option C

Explanation:
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

Question #2

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A number is increased by 20% and then decreased by 20%. What is the net change?

A. No change

B. 2% decrease

C. 4% increase

D. 4% decrease

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Correct Answer: Option D

Explanation:
Net change = x^2 / 100 % decrease. 20^2 / 100 = 400 / 100 = 4% decrease.

This question belongs to: Maths Percentage

Question #3

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A student scored 30% marks and failed by 30 marks. Another scored 42% marks and got 30 marks more than passing. Pass marks are:

A. 180

B. 150

C. 200

D. 160

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Correct Answer: Option A

Explanation:
Let max M. 0.3M + 30 = 0.42M - 30 → 0.12M = 60 → M = 500. Pass = 0.3×500 + 30 = 180.

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