Question

A and B can do a piece of work in 12 days;B and C can do it in 15 days; C ana A can do it in 20 days how much time will A take to finish the work​

Answer 1

Answer:

A+B+C Can do work in a day=1÷2( 1/12+1÷15+1÷20)

5+4+3÷(2×60)

12÷120

1÷10

B+C can do peice of work in a day1÷15

so A can finish a work in a day= (1÷10)-(1÷15)

(3-2)÷30

1÷30

A can finish the work in 30 days