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A can do (1)/(4) part of a work in 21 d...

A can do `(1)/(4)` part of a work in 21 days and B can do `(1)/(4)` part of a work in 7 days. In how many days will A and B complete the total work ?

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The correct Answer is:
21 days
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ADVANCED MATHS BY ABHINAY MATHS ENGLISH-TIME & WORK -QUESTIONS
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