A can do a work in 19 days and B in 23 days. In how many days will they complete 75% of the work together? MCQ with Answer and Explanation

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A can do a work in 19 days and B in 23 days. In how many days will they complete 75% of the work together?

A. 10.3

B. 15.3

C. 7.8

D. 12.8

Answer: Option C

Solution (By JKSSB Mock Tests)

Combined time for full work multiplied by 0.75 = 7.8 days.

This question belongs to: Maths Time and Work

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Question #1

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15 men can complete a work in 25 days. If 19 men work at the same rate, in how many days will the work be completed?

A. 19.74

B. 23.74

C. 25.74

D. 21.74

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Correct Answer: Option A

Explanation:
Total work = 15 × 25 = 375 man-days. Required days = 375/19 = 19.74 days.

This question belongs to: Maths Time and Work

Question #2

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A can complete a work in 18 days and B in 36 days. After working together for 5 days, what percentage of work remains?

A. 58.33

B. 65.83

C. 60.83

D. 63.33

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Correct Answer: Option A

Explanation:
Remaining work = (1 - 5*(1/18+1/36))×100 = 58.33%.

This question belongs to: Maths Time and Work

Question #3

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A can complete a work in 24 days and B in 48 days. After working together for 5 days, what percentage of work remains?

A. 71.25

B. 68.75

C. 76.25

D. 73.75

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Correct Answer: Option B

Explanation:
Remaining work = (1 - 5*(1/24+1/48))×100 = 68.75%.

This question belongs to: Maths Time and Work

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