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. 70

C. 60

D. 90

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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What is 30% of 400 minus 15% of 200?

A. 90

B. 80

C. 100

D. 70

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Correct Answer: Option A

Explanation:
30% of 400 = 120, 15% of 200 = 30, difference = 90.

This question belongs to: Maths Percentage

Question #2

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40% failed in Physics, 30% in Chemistry, 20% in both. % passed in both:

A. 30%

B. 50%

C. 40%

D. 60%

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Correct Answer: Option B

Explanation:
Failed at least one = 40+30-20=50%, passed both = 50%.

This question belongs to: Maths Percentage

Question #3

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

A. 3% decrease

B. 2% increase

C. 3% increase

D. 2% decrease

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Correct Answer: Option B

Explanation:
1.2 × 0.85 = 1.02, 2% increase.

This question belongs to: Maths Percentage

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