A can do a work in 15 days and B in 20 days. They work together for 6 days, then A leaves. In how many more days will B finish the remaining work? MCQ with Answer and Explanation

Question

A can do a work in 15 days and B in 20 days. They work together for 6 days, then A leaves. In how many more days will B finish the remaining work?

A. 8 days

B. 5 days

C. 4 days

D. 6 days

Answer: Option D

Solution (By JKSSB Mock Tests)

Work done in 6 days = 6×(1/15+1/20)=6×(7/60)=7/10. Remaining=3/10. B's rate=1/20, time = (3/10)×20=6 days.

This question belongs to: Maths Percentage

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Question #1

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If the price of sugar increases by 20%, by how much percent must consumption be reduced to keep expenditure constant?

A. 25%

B. 15%

C. 16.67%

D. 20%

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Correct Answer: Option C

Explanation:
Reduction % = (20/120)×100 = 16.67%.

This question belongs to: Maths Percentage

Question #2

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Mixture 40 L milk-water with 10% water. Water added to make 20%:

A. 6 L

B. 8 L

C. 4 L

D. 5 L

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Correct Answer: Option D

Explanation:
Water=4 L, milk=36 L. New total = 36/0.8 = 45 L, water added = 5 L.

This question belongs to: Maths Percentage

Question #3

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Length +25%, breadth -20%. Change in area:

A. 0%

B. 10% increase

C. 5% decrease

D. 5% increase

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Correct Answer: Option A

Explanation:
1.25×0.8 = 1, 0% change.

This question belongs to: Maths Percentage

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