Ratio between the time taken by A and B to complete a certain work is 4:5. If together they can complete a work in 20 days, in how many days can A alone complete it?

Ratio between the time taken by A and B to complete a certain work is

1.	Ratio between the time taken by A and B to complete a certain work is 4:5. If together they can complete a work in 20 days, in how many days can A alone complete it?
A.	30
B.	32
C.	36
D.	45
Answer» D. 45

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Ratio between the time taken by A and B to complete a certain work is 4:5. If together they can complete a work in 20 days, in how many days can A alone complete it?

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