Length +25%, breadth -20%. Change in area: MCQ with Answer and Explanation

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Length +25%, breadth -20%. Change in area:

A. 0%

B. 5% increase

C. 5% decrease

D. 10% increase

Answer: Option A

Solution (By JKSSB Mock Tests)

1.25×0.8 = 1, 0% change.

This question belongs to: Maths Percentage

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Question #1

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A student has to secure 40% marks to pass. He gets 150 marks and fails by 10 marks. What are the maximum marks?

A. 450

B. 300

C. 350

D. 400

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Correct Answer: Option D

Explanation:
Passing marks = 150 + 10 = 160. 40% of Maximum = 160. Maximum = 160 * (100 / 40) = 400.

This question belongs to: Maths Percentage

Question #2

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Wage decreased 25% then increased 25%. Loss %:

A. 7.5%

B. 0%

C. 5%

D. 6.25%

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Correct Answer: Option D

Explanation:
0.75×1.25 = 0.9375, loss 6.25%.

This question belongs to: Maths Percentage

Question #3

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A student divided a number by 10 instead of multiplying it by 10. What is the percentage error?

A. 100%

B. 99%

C. 95%

D. 90%

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Correct Answer: Option B

Explanation:
True = 10x. False = 0.1x. Error = 9.9x. % Error = (9.9 / 10) * 100 = 99%.

This question belongs to: Maths Percentage

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