Weight reduced from 90 kg to 81 kg. Percentage decrease: MCQ with Answer and Explanation

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Weight reduced from 90 kg to 81 kg. Percentage decrease:

A. 8%

B. 9%

C. 10%

D. 11%

Answer: Option C

Solution (By JKExamLibrary)

Decrease = 9 kg, (9/90)×100 = 10%.

This question belongs to: Maths Percentage

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Question #1

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The present value of a machine is 7,290. If it depreciates by 10% yearly, what was its value 3 years ago?

A. 12000

B. 10000

C. 11000

D. 9000

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Correct Answer: Option B

Explanation:
V_past = 7290 / (0.90)^3 = 7290 / 0.729 = 10000.

This question belongs to: Maths Percentage

Question #2

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In an exam, 35% failed in Maths, 25% in English, 15% in both. Pass percentage is:

A. 45%

B. 50%

C. 60%

D. 55%

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Correct Answer: Option D

Explanation:
Failed in at least one = 35+25-15 = 45%, pass = 55%.

This question belongs to: Maths Percentage

Question #3

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A number is increased by 10%, then increased by 20%, then decreased by 10%. Net percentage change:

A. 16% increase

B. 12.8% increase

C. 20% increase

D. 18.8% increase

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Correct Answer: Option D

Explanation:
1.1 × 1.2 × 0.9 = 1.188, increase 18.8%.

This question belongs to: Maths Percentage

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