17 men can complete a work in 21 days. If 21 men work at the same rate, in how many days will the work be completed? MCQ with Answer and Explanation

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17 men can complete a work in 21 days. If 21 men work at the same rate, in how many days will the work be completed?

A. 17.0

B. 19.0

C. 21.0

D. 23.0

Answer: Option A

Solution (By JKSSB Mock Tests)

Total work = 17 × 21 = 357 man-days. Required days = 357/21 = 17.0 days.

This question belongs to: Maths Time and Work

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Question #1

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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. 22.3

C. 17.3

D. 12.3

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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

Question #2

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A can complete a work in 26 days. What percentage of work will A complete in 6 days?

A. 38.08

B. 33.08

C. 28.08

D. 23.08

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Correct Answer: Option D

Explanation:
Percentage completed = (6/26) × 100 = 23.08%.

This question belongs to: Maths Time and Work

Question #3

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19 men can complete a work in 17 days. If 23 men work at the same rate, in how many days will the work be completed?

A. 14.04

B. 16.04

C. 18.04

D. 20.04

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Correct Answer: Option A

Explanation:
Total work = 19 × 17 = 323 man-days. Required days = 323/23 = 14.04 days.

This question belongs to: Maths Time and Work

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