Arithmetic Aptitudes › Time and Work › Question #4610
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QIf A can complete a work in 15 days and B can complete the same work in 20 days, and they work on it together for 4 days, the fraction of the work that remains to be completed is

ID: #4610 Time and Work 249 views
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#4610Q ID
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Time and WorkTopic
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  • A 1/4 ✔ ✖
  • B 1/35 ✔ ✖
  • C 7/5 ✔ ✖
  • D 8/15 ✔ ✖
Correct Answer: Option D

Explanation

A's work rate is 1/15 of the project per day,
and B's work rate is 1/20 of the project per day.
When they work together,
their combined work rate is 7/60 of the project per day.
Over a 4-day period,
they have completed 7/15 of the project.
The remaining work is therefore 8/15 of the project, which means that they still have 8/15 of the project left to complete

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