Question

Unitary method
Ram can do work in 28 days.. Shyam can do work in 15 days.. If they both do the work together, how many days will be taken..

Answer 1

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HERE IT IS GIVEN...........
Ram can do work in 28 days..
Shyam can do work in 15 days..
find..
how many days will be taken..
if they do together
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now....
Ram can do work in 28 days..
so.... ram can do 1/28 work in one day..

Shyam can do work in 15 days..
and shyam can do the 1/15 work in one day
therefore ...
they will do 1/28+1/15 work in one day..
they will do 43/420 work in one day..
So.....
the will do 1 work in 420 /43 days...
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