A can do a piece of work in 20 days. B is 25% more efficient than A. How many days will B alone take to do the work? MCQ with Answer and Explanation

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A can do a piece of work in 20 days. B is 25% more efficient than A. How many days will B alone take to do the work?

A. 16 days

B. 14 days

C. 18 days

D. 15 days

Answer: Option A

Solution (By JKSSB Mock Tests)

Efficiency ratio A:B = 100:125 = 4:5. Time ratio = 5:4. B's time = (4/5)×20 = 16 days.

This question belongs to: Maths Percentage

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Question #1

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Cost price Rs. 800, marked up 60%, then discount 30%. Profit percent:

A. 8%

B. 12%

C. 10%

D. 15%

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Correct Answer: Option B

Explanation:
MP = 800×1.6=1280, SP = 1280×0.7=896, profit 96, % = (96/800)×100 = 12%.

This question belongs to: Maths Percentage

Question #2

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A number increased by 25% then by 20% becomes 180. Original number:

A. 110

B. 130

C. 100

D. 120

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Correct Answer: Option D

Explanation:
x × 1.25 × 1.2 = 1.5x = 180 → x = 120.

This question belongs to: Maths Percentage

Question #3

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In a class of 50, 40% are girls. Number of boys is:

A. 28

B. 32

C. 30

D. 25

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Correct Answer: Option C

Explanation:
60% of 50 = 30 boys.

This question belongs to: Maths Percentage

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