Question

A an b can do a piece of work in 12 days. B and c cab do it in 15 days, while c and a can do it in 20 days. In how many days will they finish it working together. Also how many days can a alone do it

Answer 1

Answer:

all together = 10 Days

a alone = 30 Days

Please mark the answer as "The Brainliest answer" if you like it

Step-by-step explanation:

1/12 = 1/a + 1/b

1/15 = 1/b + 1/c

1/20 = 1/c + 1/a

Adding all above and divide by 2

(1/2)*(1/12 + 1/15 + 1/20) = 1/a + 1/b + 1/c

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

1/10 = 1/a + 1/b + 1/c

10 days

1/a = 1/10 - 1/15 = (1/30)(3-2) = 1/30

a = 30