In a school, 80% of 400 students are present. Number absent is: MCQ with Answer and Explanation

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In a school, 80% of 400 students are present. Number absent is:

A. 90

B. 80

C. 60

D. 70

Answer: Option B

Solution (By JKSSB Mock Tests)

Absent = 20% of 400 = 80.

This question belongs to: Maths Percentage

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Question #1

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If the numerator of a fraction is increased by 50% and denominator decreased by 25%, the fraction becomes 3/2. Original fraction:

A. 7/8

B. 3/4

C. 4/5

D. 5/8

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Correct Answer: Option B

Explanation:
(1.5a)/(0.75b) = 2a/b = 3/2 → a/b = 3/4.

This question belongs to: Maths Percentage

Question #2

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

A. 140

B. 120

C. 150

D. 130

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Correct Answer: Option A

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

This question belongs to: Maths Percentage

Question #3

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A number is increased by 10%, then increased by 25%, then decreased by 10%. Net percentage change:

A. 23.75% increase

B. 20% increase

C. 25% increase

D. 22.5% increase

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Correct Answer: Option A

Explanation:
1.1 × 1.25 × 0.9 = 1.2375, increase 23.75%.

This question belongs to: Maths Percentage

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