George does 3/5th of a piece of work in 9 days. He then calls Paul and they finish the work in 4 days. How long would Paul take to do the work by himself ?



George does 3/5th of a piece of work in 9 days. He then calls Paul and they finish the work in 4 days. How long would Paul take to do the work by himself ?

A . 28

B . 32

C . 30

D . 35

Answer : C . 30


Explanation:

    George 9 days work = 3/5
    George 1 days work = 3/5 * 9
    = 1/15.
    George and Paul 4 days work = 2/5
    George and Paul 1 days work = 2/5 * 4
    = 1/10.
    Paul 1 days work = George and Paul 1 days work - George 1 days work
    = 1/10 - 1/15
    = 1/30

    So Paul takes 30 days to complete work.


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