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

Question Report Error

Radius of circle decreased 20%. Area decreases by:

A. 34%

B. 38%

C. 36%

D. 32%

Answer: Option C

Solution (By JKExamLibrary)

Area multiplier = 0.8² = 0.64, decrease 36%.

This question belongs to: Maths Percentage

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Practice More Percentage Questions

Question #1 Report Error

A student answered 22 out of 30 correctly. Percentage correct:

A. 70%

B. 73.33%

C. 75%

D. 72%

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Correct Answer: Option B

Explanation:
(22/30)×100 ≈ 73.33%.

This question belongs to: Maths Percentage

Question #2 Report Error

If a number is decreased by 10%, it becomes 90. What is the number?

A. 90

B. 100

C. 110

D. 80

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Correct Answer: Option B

Explanation:
Let the number be x. x * 0.90 = 90. x = 90 / 0.90 = 100.

This question belongs to: Maths Percentage

Question #3 Report Error

10% voters did not vote in an election. The winner got 60% of polled votes and won by 900 votes. Total voters:

A. 6000

B. 5000

C. 4500

D. 5500

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
Polled votes P=0.9T. Margin 0.2P = 900 → P=4500 → T=5000.

This question belongs to: Maths Percentage

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