45% read newspaper A, 55% read B, 15% both. % read neither: MCQ with Answer and Explanation

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45% read newspaper A, 55% read B, 15% both. % read neither:

A. 15%

B. 30%

C. 20%

D. 25%

Answer: Option A

Solution (By JKSSB Mock Tests)

At least one = 45+55-15=85%, neither = 15%.

This question belongs to: Maths Percentage

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Question #1

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In a town, the population increases by 20% during the first year and decreases by 20% during the second year. If the net change in population is a decrease of 400, find the initial population.

A. 8000

B. 12000

C. 9000

D. 10000

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Correct Answer: Option D

Explanation:
Net multiplier = 1.2 × 0.8 = 0.96, decrease 4% = 400 → initial = 400/0.04 = 10000.

This question belongs to: Maths Percentage

Question #2

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A sum of money at compound interest becomes 3 times in 6 years. How many years will it take to become 27 times?

A. 24 years

B. 18 years

C. 12 years

D. 15 years

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Correct Answer: Option B

Explanation:
3^3=27. Since 3 times in 6 years, 27 times = 3 intervals = 18 years.

This question belongs to: Maths Percentage

Question #3

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If the length of a rectangle is increased by 20%, by what percentage must the width be decreased to maintain the same area?

A. 25%

B. 20%

C. 16.67%

D. 30%

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Correct Answer: Option C

Explanation:
Required decrease = (20 / 120) * 100 = 16.67%.

This question belongs to: Maths Percentage

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