Question

9. A can do a job in 20 days, B in 30 days and C in 60 days. If A is helped by B and C on every third day,
then in how many days will the job be finished?​

Answer 1

Step-by-step explanation:

A' 2 day's work = 1 x 2 = 1 .

20 10

(A + B + C)'s 1 day's work = 1 + 1 + 1 = 6 = 1 .

20 30 60 60 10

Work done in 3 days = 1 + 1 = 1 .

10 10 5

Now, 1 work is done in 3 days.

5

Whole work will be done in (3 x 5) = 15 days.

If you can't understand what I wrote then look at the picture