Question

52. A can do a job in 20 days, B in 30 days and C in 60 days. If A is helped on every 3 rd
day by B and C, then in how many days, the job is finished?
A. 12 days
B. 15 days
C. 20 days
D. 10 days

with explanation please....​

Answer 1

Answer:

A.12

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