Question

A and B can polish the floors of a building in 25 days. A alone can do 1/3 of this

job in 15 days. In how many days can B alone polish the floors of the building?

Answer 1

let A can do a work in one day
B = b work in one day

and total work = x

so
25(a+b) = x
and
15a = x/3

so a= x/45

then
b = x/25 - a
= x/25 - x/45
= 4x/145

so
B alone can complete job in
145/4 days
= 36.25 days


hope it helps you
@di