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 :
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 |
 (A + C)'s 1 day's work |
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So, A and C together will do the work in 8 days.
Discussion:
54 comments Page 6 of 6.
Jeeva909 said:
1 decade ago
Hi am little week in maths, so please somebody explain me the answer how this [2x1/6]-[1/8+1/12] came?
Y. Balaji said:
1 decade ago
@ Jeev.
Don't worry and don't confuse. Just think.
A+B+C = 1/6 => equation 1.
A+B = 1/8 => equation 2.
B+C = 1/12 => equation 3.
From equation 1&3 (1-3).
A = (1/6) - (1/12) = (1/12) => 4.
From equation 1&2 (1-2).
C = (1/6) - (1/8) = (1/24) => 5.
Now A+C = (1/12) + (1/24) = 1/8.
= 8 days.
Don't worry and don't confuse. Just think.
A+B+C = 1/6 => equation 1.
A+B = 1/8 => equation 2.
B+C = 1/12 => equation 3.
From equation 1&3 (1-3).
A = (1/6) - (1/12) = (1/12) => 4.
From equation 1&2 (1-2).
C = (1/6) - (1/8) = (1/24) => 5.
Now A+C = (1/12) + (1/24) = 1/8.
= 8 days.
Cheema said:
1 decade ago
How come 3/24?
Nandakumar said:
2 decades ago
How can i take 2*1/8-(1/8+1/12)?
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