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. 80

B. 90

C. 70

D. 60

Answer: Option A

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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A man spends 50% of his income. His income rises by 50% and expenditure by 20%. Percentage increase in savings is:

A. 80%

B. 60%

C. 70%

D. 90%

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Correct Answer: Option A

Explanation:
Let income = 100, exp = 50, sav = 50. New income = 150, exp = 60, sav = 90. Increase = 40 on 50 = 80%.

This question belongs to: Maths Percentage

Question #2

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To pass an exam, 40% is required. A student got 150 marks and failed by 30 marks. Maximum marks are:

A. 550

B. 500

C. 400

D. 450

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Correct Answer: Option D

Explanation:
Pass marks = 150 + 30 = 180. 40% of Max = 180 → Max = 180/0.4 = 450.

This question belongs to: Maths Percentage

Question #3

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The ratio of boys to girls in a school is 3:2. If 20% of boys and 25% of girls are adults, what percentage of the total students are non-adults?

A. 80%

B. 78%

C. 75%

D. 70%

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Correct Answer: Option B

Explanation:
Let boys = 60, girls = 40. Total = 100. Adult boys = 20% of 60 = 12. Adult girls = 25% of 40 = 10. Total adults = 22. Non-adults = 100 - 22 = 78. Percentage = 78%.

This question belongs to: Maths Percentage

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