Answer with Explanation:
(A + B + C)'s 1 day's work = 1/6 ;
(A + B)'s 1 day's work = 1/8 ;
(B + C)'s 1 day's work = 1/12 .
Therefore (A + C)'s 1 day's work
= ( 2 x 1/6) - (1/8 + 1/12)
= (1/3 -5/24)
= 3/24
= 1/8
So, A and C together will do the work in 8 days.
(A + B + C)'s 1 day's work = 1/6 ;
(A + B)'s 1 day's work = 1/8 ;
(B + C)'s 1 day's work = 1/12 .
Therefore (A + C)'s 1 day's work
= ( 2 x 1/6) - (1/8 + 1/12)
= (1/3 -5/24)
= 3/24
= 1/8
So, A and C together will do the work in 8 days.