Question

A and B together can finish a job in
20 days. B and C together can finish
the same job in 30 days. If A and C
together can finish it in 24 days, in how
many days can A alone finish the job?

Answer 1

Answer:

Step-by-step explanation:

A+B takes 20 days

B+C takes 30 days

Since A is twice as efficient as C we can rewrite equation (1) as

2C+B takes 20 days, B+C takes 30 days

Let the total unit of work be 60

B+C one day work = 60/30=2

2C+B one day work = 60/20=3  

(4)-(3) gives C’s one day work i.e 1

C will take 60/1 =60 days