Question

A and b can do a work in 12 days b and c in 15 days and a and c in 20 days then a alone in how many days

Answer 1

Answer:

30 Days

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Step-by-step explanation:

1/a + 1/b = 1/12   Eq A

1/b + 1/c  = 1/15   Eq B

1/a + 1/c = 1/20   Eq C

A+C - B

2/a = 1/12 + 1/20 - 1/15

2/a = (1/60)(5+3-4)

2/a = 1/15

a = 30