Length of rectangle increased by 20%, breadth decreased by 15%. Percentage change in area: MCQ with Answer and Explanation

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Length of rectangle increased by 20%, breadth decreased by 15%. Percentage change in area:

A. 2% decrease

B. 3% increase

C. 2% increase

D. 3% decrease

Answer: Option C

Solution (By JKExamLibrary)

1.2 × 0.85 = 1.02, 2% increase.

This question belongs to: Maths Percentage

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Question #1

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The present ages of A and B are in the ratio 6:7. After 8 years, the ratio of their ages will be 8:9. Find the sum of their present ages.

A. 60 years

B. 56 years

C. 48 years

D. 52 years

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Correct Answer: Option D

Explanation:
Ages 6x,7x. (6x+8)/(7x+8)=8/9 → 54x+72=56x+64 → 2x=8 → x=4. Sum=6x+7x=13x=52.

This question belongs to: Maths Percentage

Question #2

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0.04 as percent is:

A. 0.4%

B. 0.04%

C. 40%

D. 4%

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Correct Answer: Option D

Explanation:
0.04 × 100 = 4%.

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. 20% increase

B. 12.8% increase

C. 16% 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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