65% of a number is 21 less than 80%. Number is: MCQ with Answer and Explanation

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65% of a number is 21 less than 80%. Number is:

A. 140

B. 130

C. 120

D. 150

Answer: Option A

Solution (By JKSSB Mock Tests)

0.8x - 0.65x = 21 → 0.15x = 21 → x = 140.

This question belongs to: Maths Percentage

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Question #1

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If the length of a rectangle is increased by 20% and the breadth is decreased by 10%, what is the percentage change in area?

A. 6% increase

B. 8% increase

C. 12% increase

D. 10% increase

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Correct Answer: Option B

Explanation:
1.2 × 0.9 = 1.08, 8% increase.

This question belongs to: Maths Percentage

Question #2

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Cost article Rs. 500, marked up 60%, then 25% discount. Selling price:

A. 575

B. 600

C. 625

D. 550

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Correct Answer: Option B

Explanation:
Marked = 500×1.6 = 800, SP = 800×0.75 = 600.

This question belongs to: Maths Percentage

Question #3

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Decrease 900 by 30%. Result is:

A. 610

B. 620

C. 600

D. 630

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Correct Answer: Option D

Explanation:
900 × 0.7 = 630.

This question belongs to: Maths Percentage

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