Question

a can do a work in 20 days and b in 15 days and c in 15 days if they work together how many days

Answer 1

Answer:

Answer

Given A can do the work in 20 days and B can do it 15 days.

Then work done by A in one day =201​

And, work by B in one day =151​

Then, the work done by A & B in one day =201​+151​=607​

A & B done 6 days together then work done in A & B in 6 days =607​×6=107​

Then friction of work left =1−107​=103​

Then B can  do  103​  work =103​×115​=29​=421​ days