Question

A, B and C can complete a work in 15, 20 and 30 days respectively, working alone. A starts the
work. He works alone for one day, then B works alone for two days, then C works alone for three
days, then again A works alone for one day and so on. On which day will the work get completed?
3) 20th
4) 21st
5) 22nd
1) 18th
2) 19th​

Answer 1

Answer:

(A+B+C)'s one day's work=

10

1

+

15

1

+

20

1

=

60

13

Fraction of work done by B=

60

13

15

1

=

13

4