Aptitude - Time and Work - Discussion

Discussion Forum : Time and Work - General Questions (Q.No. 26)
26.
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 together can finish it in 6 days. A and C together will do it in :
4 days
6 days
8 days
12 days
Answer: Option
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 ) - ( 1 + 1 )
6 8 12
= ( 1 - 5 (
3 24
= 3
24
= 1 .
8

So, A and C together will do the work in 8 days.

Discussion:
53 comments Page 5 of 6.

Azuu said:   1 decade ago
How to take lcm of 1/8+1/12 ?

SIVA said:   5 years ago
Good explanation. Thanks all.
(2)

Vikas said:   8 years ago
Thanks for the explanation.

Raghav said:   9 years ago
Excellent guys! Keep it up.

Sujeet said:   1 decade ago
Why 2 is multiplied by 1/6.

Setu kumar said:   10 years ago
How we have taken (2*1/6)?

Tanveer sayyed said:   3 years ago
5/24 how? anyone explain.
(1)

Gulshan said:   1 decade ago
24 is lcm of 8 & 12

Ricky nahar said:   7 years ago
@Nandhu.

Why a=2?

Rohit kushwaha said:   7 years ago
Thank you @Bhanu.


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