Question

1. A can build a wall in the same time in which B and C together can do it. If A and B together could do it in 25 days and C alone in 35 days, in what time could B alone do it?

Answer 1

Answer:

175 days

Step-by-step explanation:

A=(B+C)       eq(1)

A+B=1/25 days eq(2)

C=1/35 days         eq(3)

from Eq(1) A-B=C        eq(4)

from eq (4) and (3)

A-B=1/35   eq(5)

solving eq (2) and eq(5)

we get A=6/175 days

by substituting A in eq(2)

we get B=175 days