Question

'A' can do a piece of work in 20 days which 'B' alone can do in 12 days 'B' worked at it for 9 days then 'A' can finish the remaining work in :

(a) 3 days
(b) 5 days
(c) 7 days
(d) 11 days​

Answer 1

Answer:

B's 9 day's work = (  1/12 x 9)=3/4

Remaining work = 1-3/4 = 1/4

1/20 work is finished by A in 1 day.

1/4 work is finished by A in (20x1/4) = 5days