Question

A and B can do a piece of work in 12 days, B and C in 15 days, C and A in 20 days. How long would A take separately to do the same work​

Answer 1

Step-by-step explanation:

A+B(1day′s)=121work

B+C(1day′s)=151work

A+C(1day′s)=201work

Adding all the above,

2(A+B+C)(1day′s)=121+151+201

=605+4+3=6012=51work

∴A+B+C(1day′s)=101work

∴C(1day′s)=(A+B+C)(1day′s)−(A+B)(aday′s)

=101−