If the length of a rectangle is increased by 25%, by what percentage must the width be decreased to keep the area unchanged? MCQ with Answer and Explanation

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If the length of a rectangle is increased by 25%, by what percentage must the width be decreased to keep the area unchanged?

A. 20%

B. 25%

C. 33.33%

D. 15%

Answer: Option A

Solution (By JKSSB Mock Tests)

Required decrease = (25 / 125) * 100 = 20%.

This question belongs to: Maths Percentage

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Practice More Percentage Questions

Question #1

18 is what percentage of 120?

A. 20%

B. 12%

C. 15%

D. 18%

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Correct Answer: Option C

Explanation:
(18 / 120) * 100% = (3 / 20) * 100% = 15%.

This question belongs to: Maths Percentage

Question #2

In an examination, 35% students failed in English, 30% failed in Mathematics and 20% failed in both. If the total number of students passing in both subjects is 550, find the total number of students.

A. 1000

B. 800

C. 1100

D. 900

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Correct Answer: Option A

Explanation:
Failed in at least one = 35+30-20 = 45%. Passed in both = 55% = 550 → total = 550/0.55 = 1000.

This question belongs to: Maths Percentage

Question #3

A weight is measured as 9.8 kg instead of 10 kg. What is the percentage error?

A. 4%

B. 2%

C. 1%

D. 3%

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Correct Answer: Option B

Explanation:
Error = 10 - 9.8 = 0.2. % Error = (0.2 / 10) * 100 = 2%.

This question belongs to: Maths Percentage

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