Radius of circle decreased 20%. Area decreases by: MCQ with Answer and Explanation

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Radius of circle decreased 20%. Area decreases by:

A. 32%

B. 34%

C. 36%

D. 38%

Answer: Option C

Solution (By JKSSB Mock Tests)

Area multiplier = 0.8² = 0.64, decrease 36%.

This question belongs to: Maths Percentage

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Question #1

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If the cost price of 12 articles is equal to the selling price of 10 articles, what is the profit percent?

A. 25%

B. 18%

C. 15%

D. 20%

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Correct Answer: Option D

Explanation:
Let CP of 1 article = Re.1. CP of 12 = 12, SP of 10 = 12 → SP of 1 = 1.2, profit% = 20%.

This question belongs to: Maths Percentage

Question #2

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A man gave 25% of his money to his wife and 40% of the remainder to his son. If he still had Rs. 4500 left, what was the total amount?

A. Rs. 10000

B. Rs. 9000

C. Rs. 12000

D. Rs. 8000

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Correct Answer: Option A

Explanation:
Wife 25%, left 75%. Son 40% of 75% = 30% of total. Left 45% = 4500 → total=10000.

This question belongs to: Maths Percentage

Question #3

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What percentage of 50 is 20?

A. 20%

B. 30%

C. 40%

D. 50%

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Correct Answer: Option C

Explanation:
(20 / 50) * 100 = 40%.

This question belongs to: Maths Percentage

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