Question

A and B can polish the floors of a building in 20 days .A alone can do 1/4 of this work in 15days .In how many days can B alone polish the floor of the building.

Answer 1

Answer:

30 Days

Step-by-step explanation:

A+B can do in 20 days

A can do 1/4 in 15 days

so A can do whole work in 15*4 = 60 days

1/B = 1/(A+B)   - 1/A

1/B = 1/20  - 1/60

1/B = (1/60)(3-1)

1/B = 2/60

B = 30 Days