Question

4. A and B can do a work in 8 days. B and C can do the same work in 12 days. A,
B and C can together finish it in 6 days. A and C together will do it in how many
days?
(A) 4
(B) 6
(C) 8
(D) 12​

Answer 1

Step-by-step explanation:

i think its d) 12

pls mark my answer as brainliest

Answer 2

Step-by-step explanation:

(1/a+1/b)= 1/8

1/b= 1/8- 1/a

(1/b+1/c)=1/12

1/c= 1/12-1/b

(1/a+1/b+1/c)=1/6

1/a+1/8-1/a+1/c=1/6

1/8+1/c=1/6

1/c= 1/6-1/8= (4-3)/24= 1/24

1/b= 1/12-1/24= 2-1/24= 1/24

1/a= 1/8-1/b = 1/8-1/24= 3-1/24=2/24= 1/12

now, 1/a +1/c = 1/12+ 1/24= 3/24 = 1/8

c is the correct option