Question

12- Neeraj, Ravi And dashrath manjhi alone break a big stone in 20 days, 30days
and 60 days. Neeraj, ravi and manjhi start the work together and after some
days Neeraj left the work and after next 10days ravi also left the work
remaining work done by Manjhi alone in Sdays. The big stone break in how
many days?
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Answer 1

Answer:

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