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A can do a work in 12 days and B can do ...

A can do a work in 12 days and B can do the same work in 16 days. If they work on it together for 4 days, then the fraction of the work that is left is:
A एक कार्य को 12 दिनों में कर सकता है और B उसी कार्य को 16 दिनों में कर सकता है। यदि वे 4 दिनों के लिए इस पर एक साथ कार्य करते हैं, फिर जो कार्य बचा है उसका अंश है:

A

`3/5`

B

`9/16`

C

`5/12`

D

`7/8`

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