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Two persons can complete a piece of work in 9 days. How many more persons are needed to complete double the work in 12 days?
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- 3
- 2
- 4
- 1
Correct Option: A
where x = number of persons
 | : : 2 : x | 12 : 9 |
⇒ 1× 12 × x = 2 × 9 × 2
| ⇒ x = | = 3 | 12 |
Aliter : Using Rule 1,
Here, M1 = 2, W1 = 1, D1 = 9
M2 = ?, W2 = 2, D2 = 12
M1D1W2 = M2D2W1
2 × 9 × 2 = M2 × 12 × 1
| ⇒ M2 = | M2 = 3 | 12 |
