Question

10. A, B and C together can do a piece of work in 15 days, B alone can do it in 30 days and C alone can do it in 40 days. In how many days will A alone do the work?

(Please explain with answer) ​

Answer 1

Answer:

B can do 1/30 work in one day

C can do 1/40 work in one day

all together can do 1/15 work in one day

let A do 1/x work in one day

(1/x) + (1/30) + (1/40) = (1/15)

1/x = (1/15) - (1/30) -(1/40)

= (8-4-3)/120

= 1/120