Radius of a circle increased by 50%. Percentage increase in area: MCQ with Answer and Explanation

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Radius of a circle increased by 50%. Percentage increase in area:

A. 100%

B. 125%

C. 200%

D. 150%

Answer: Option B

Solution (By JKSSB Mock Tests)

Area proportional to radius². New radius 1.5r, area 2.25 times, increase = 125%.

This question belongs to: Maths Percentage

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Question #1

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A man spends 40% of his income on food, 25% on rent, 15% on education and saves the rest. If his savings are Rs. 4500, find his income.

A. Rs. 20000

B. Rs. 27500

C. Rs. 22500

D. Rs. 25000

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Correct Answer: Option C

Explanation:
Spend % = 40+25+15 = 80%, save 20% = 4500, income = 4500/0.2 = 22500.

This question belongs to: Maths Percentage

Question #2

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A's marks 25% more than B, B's 20% less than C. A=150, find C:

A. 150

B. 140

C. 130

D. 120

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Correct Answer: Option A

Explanation:
A=1.25B, B=0.8C → A=1.25×0.8C = C, so C=150.

This question belongs to: Maths Percentage

Question #3

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In an examination, 70% passed in English, 65% in Maths and 15% failed in both subjects. If 300 students passed in both, total number of students was:

A. 550

B. 600

C. 650

D. 500

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Correct Answer: Option B

Explanation:
Failed Eng=30%, Maths=35%. Passed both = 100 - (30+35-15) = 50%. 50% of total = 300 → total = 600.

This question belongs to: Maths Percentage

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