Side of square increased 15%. % increase in area: MCQ with Answer and Explanation

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Side of square increased 15%. % increase in area:

A. 30%

B. 40%

C. 32.25%

D. 35%

Answer: Option C

Solution (By JKSSB Mock Tests)

Area multiplier = 1.15² = 1.3225, increase 32.25%.

This question belongs to: Maths Percentage

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Question #1

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If 60% of a number is subtracted from another number, the second number reduces to 52% of itself. Find the ratio of the first to the second.

A. 4:5

B. 2:3

C. 5:8

D. 3:4

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Correct Answer: Option A

Explanation:
y - 0.6x = 0.52y → 0.48y = 0.6x → x/y = 0.48/0.6 = 4/5.

This question belongs to: Maths Percentage

Question #2

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If the radius of a circle is decreased by 30%, the area decreases by:

A. 49%

B. 60%

C. 51%

D. 42%

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Correct Answer: Option C

Explanation:
New area = 0.7² = 0.49, decrease 51%.

This question belongs to: Maths Percentage

Question #3

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20 is what percent of 80?

A. 25%

B. 20%

C. 30%

D. 35%

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Correct Answer: Option A

Explanation:
(20/80)×100 = 25%.

This question belongs to: Maths Percentage

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