A can do a work in 18 days and B in 28 days. They work together for 5 days. What percentage of work remains? MCQ with Answer and Explanation

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A can do a work in 18 days and B in 28 days. They work together for 5 days. What percentage of work remains?

A. 64.37

B. 59.37

C. 54.37

D. 69.37

Answer: Option C

Solution (By JKSSB Mock Tests)

Remaining work = (1 - 5*(1/18+1/28)) ×100 = 54.37%.

This question belongs to: Maths Time and Work

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Question #1

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12 men can complete a work in 16 days. If 16 men work at the same rate, in how many days will the work be completed?

A. 18.0

B. 14.0

C. 12.0

D. 16.0

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Correct Answer: Option C

Explanation:
Total work = 12 × 16 = 192 man-days. Required days = 192/16 = 12.0 days.

This question belongs to: Maths Time and Work

Question #2

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A and B work together. A alone can complete the work in 30 days and B alone in 26 days. What percentage of the total daily work is contributed by A?

A. 53.93

B. 46.43

C. 51.43

D. 48.93

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Correct Answer: Option B

Explanation:
A share = (1/30) / (1/30+1/26) ×100 = 46.43%.

This question belongs to: Maths Time and Work

Question #3

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A can complete a work in 10 days and B in 27 days. If they work together, the work will be completed in:

A. 7.3

B. 12.3

C. 17.3

D. 22.3

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Correct Answer: Option A

Explanation:
Combined rate = 1/10 + 1/27. Required time = 7.3 days.

This question belongs to: Maths Time and Work

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