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. 34%

B. 36%

C. 32%

D. 38%

Answer: Option B

Solution (By JKSSB Mock Tests)

Area multiplier = 0.8² = 0.64, decrease 36%.

This question belongs to: Maths Percentage

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Practice More Percentage Questions

Question #1

10% of 300 + 20% of 150 equals:

A. 50

B. 55

C. 60

D. 65

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Correct Answer: Option C

Explanation:
10% of 300 = 30, 20% of 150 = 30, sum = 60.

This question belongs to: Maths Percentage

Question #2

Employees reduced by 25%. To keep total wage bill same, wage per head must increase by:

A. 33.33%

B. 25%

C. 20%

D. 30%

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Correct Answer: Option A

Explanation:
New employees 0.75, wage per head multiplier = 1/0.75 = 1.3333, increase 33.33%.

This question belongs to: Maths Percentage

Question #3

The population of a town is 120000. It increases by 15% in the first year and decreases by 10% in the second year. What is the population after two years?

A. 126500

B. 124200

C. 123000

D. 125000

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Correct Answer: Option B

Explanation:
120000 × 1.15 × 0.9 = 124200.

This question belongs to: Maths Percentage

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