Question

8. A and B can do a piece of work in 18 days, B
and C in 24 days, A and C in 36 days. What
time will they take if they work together?​

Answer 1

A, B, and C do the job in a, b, and c days, respectively. Working together, in one day A and B complete

1a+1b=118

of the job per day, B and C complete

1b+1c=124

of the job per day, and A and C complete

1a+1c=136

of the job per day. Solving the system of equations,

1a=1481b=51441c=1144

Working together, A, B, and C complete

148+5144+1144=116

of the job per day, finishing in 16 days.

Answer 2

your answer 16.......