Question

4. A and B can do a piece of work in 12 days, C and A in 20 days and
in 15 days, then in how many days will they finish it working together?
(a) 20 days (b) 5 days (c) 15 days (d) 10 days
560cm and one of its side is 20 cm then​

Answer 1

Step-by-step explanation:

A one day work= 1/15

B 's one day work=1/12-1/15

1/60

C one day work=1/20

they finish the work together=1/15+1/60+1/20

=8/60=2/15