Question

a, b and c can do a piece of work in 15 days.b alone do in 30 days,c alonr do in 40 dsys, in hoe msny days s slone can do yhis work.

Answer 1

please mark it as a brainliest answer

Answer 2

1/a +1/30+ 1/40 = 15
120a + 40+ 30 = 120*15
120a + 70 = 1800
120a = 1630
a= 163/12
a= 13.5 days