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. 130

B. 150

C. 120

D. 140

Answer: Option D

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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A student multiplied a number by 4/5 instead of 5/4. What is the percentage error?

A. 36%

B. 25%

C. 30%

D. 45%

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Correct Answer: Option A

Explanation:
Error = (5/4 - 4/5)x = (9/20)x. % Error = ((9/20) / (5/4)) * 100 = (9/25) * 100 = 36%.

This question belongs to: Maths Percentage

Question #2

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1/4 as percentage is:

A. 20%

B. 15%

C. 25%

D. 30%

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Correct Answer: Option C

Explanation:
(1/4)×100 = 25%.

This question belongs to: Maths Percentage

Question #3

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Mixture 40 L milk-water with 10% water. Water added to make 20%:

A. 8 L

B. 4 L

C. 6 L

D. 5 L

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Correct Answer: Option D

Explanation:
Water=4 L, milk=36 L. New total = 36/0.8 = 45 L, water added = 5 L.

This question belongs to: Maths Percentage

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