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A can do a work in 12 days and B can do it in 16 days. A and B started the work jointly and A left 2 days before the work is finished. Find the number of days they took to finish the work.
(1) (2)
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- 6 days
- 7 days
- 9 days
- 8 days
Correct Option: D
Let the required number of days be x.
∴ A’s work in (x – 2) days
| = | 12 |
| B’s work in x days = | 16 |
| = | + | = 1 | ||
| 12 | 16 |
| ⇒ | = 1 | 48 |
⇒ 7x = 48 + 8 = 56
⇒ x = 8 days
