In a class of 40, 30% are girls. Number of boys is: MCQ with Answer and Explanation

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In a class of 40, 30% are girls. Number of boys is:

A. 30

B. 28

C. 32

D. 26

Answer: Option B

Solution (By JKSSB Mock Tests)

70% of 40 = 28 boys.

This question belongs to: Maths Percentage

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Question #1

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The price of an article increases by 10%, and then again by 10%. What is the net percentage increase?

A. 21%

B. 22%

C. 20%

D. 25%

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Correct Answer: Option A

Explanation:
Successive percentage formula: a + b + (ab / 100). 10 + 10 + (10 * 10 / 100) = 20 + 1 = 21%.

This question belongs to: Maths Percentage

Question #2

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A student divided a number by 10 instead of multiplying it by 10. What is the percentage error?

A. 90%

B. 95%

C. 100%

D. 99%

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Correct Answer: Option D

Explanation:
True = 10x. False = 0.1x. Error = 9.9x. % Error = (9.9 / 10) * 100 = 99%.

This question belongs to: Maths Percentage

Question #3

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A number is divided by 5 and the quotient is increased by 10% then decreased by 10%. The result is 198. Find the number.

A. 900

B. 800

C. 1000

D. 1100

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Correct Answer: Option C

Explanation:
(N/5)×1.1×0.9 = (N/5)×0.99 = 198 → N/5 = 200 → N=1000.

This question belongs to: Maths Percentage

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