A and B can do a work in 12 days. B and C in 15 days. A and C in 20 days. If A, B, and C work together, how long will they take? MCQ with Answer and Explanation

Question

A and B can do a work in 12 days. B and C in 15 days. A and C in 20 days. If A, B, and C work together, how long will they take?

A. 10 days

B. 11 days

C. 8 days

D. 9 days

Answer: Option A

Solution (By JKSSB Mock Tests)

2(A+B+C) = 1/12 + 1/15 + 1/20 = (5+4+3)/60 = 12/60 = 1/5 → A+B+C = 1/10. Together 10 days.

This question belongs to: Maths Percentage

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Question #1

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Price of a commodity falls by 15%. To keep expenditure constant, consumption must increase by:

A. 18%

B. 20%

C. 15%

D. 17.64%

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Correct Answer: Option D

Explanation:
New price 0.85, consumption multiplier needed = 1/0.85 ≈ 1.17647, increase 17.64%.

This question belongs to: Maths Percentage

Question #2

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35 is what percent of 140?

A. 30%

B. 20%

C. 22.5%

D. 25%

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Correct Answer: Option D

Explanation:
(35/140)×100 = 25%.

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Question #3

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60 L mixture, milk:water 2:1. To make 1:2, water added:

A. 60 L

B. 50 L

C. 65 L

D. 55 L

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Correct Answer: Option A

Explanation:
Milk=40 L, water=20 L. For 1:2, water=80 L, add 60 L.

This question belongs to: Maths Percentage

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