A can do a piece of work in 10 days and B in 15 days. For with the help of C, they finish the work in 4 days. How long will it take C alone to finish the work?
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A can do a piece of work in 10 days and B in 15 days. For with the help of C, they finish the work in 4 days. How long will it take C alone to finish the work?
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Step-by-step explanation:
A can do work in 10 days
∴ A does 10 /1 of the work in 1 day
Similarly B does 20 /1 of the work in 1 day
Let C complete the work in 'x' days C does x /1 the work in 1 day
In 4 days, A,B & C complete the work
⇒4( 10/1+ 20 /1 + x /1 )=1
x/4 = 5 /2
x=10
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