Question 936182
A,B, and C can do a piece of work in 10 days. A and B can do it in 12 days, A and C in 20 days. How many days would it take each to do the work alone?
solution
A+B+C  1 days work=1/10  (1)
A+B 1 days work =1/12    (2)
A+C 1 days work =1/20    (3)
by substituting 2 and value in equation (1)
 C 1 days work=1/10-1/12= 1/60
similarly B 1 days work =1/10 -1/20= 1/20
A 1 day work will be =1/10-1/60-1/20 =2/60=1/30
A can complete in 30 ,B can complete 20 days   and C can complete 60 days