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. 14 days

B. 18 days

C. 16 days

D. 15 days

Answer: Option C

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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A town's population was 100,000 and is now 121,000. If the annual increase is 10%, in how many years did this increase occur?

A. 1

B. 3

C. 2

D. 4

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Correct Answer: Option C

Explanation:
121000 = 100000 * (1.10)^t. 1.21 = (1.10)^t. Since 1.10^2 = 1.21, t = 2 years.

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Question #2

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In a mixture of 120 litres, the ratio of milk and water is 2:1. How much water is added to change the ratio to 1:2?

A. 120 L

B. 110 L

C. 130 L

D. 100 L

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Correct Answer: Option A

Explanation:
Milk=80, water=40. For 1:2, water=160, add 120 L.

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Question #3

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Number increased 30% then decreased 25%. Net change:

A. 5% increase

B. 2.5% decrease

C. 5% decrease

D. 2.5% increase

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Correct Answer: Option B

Explanation:
1.3 × 0.75 = 0.975, 2.5% decrease.

This question belongs to: Maths Percentage

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