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7 men can complete a piece of work in 12 days. How many additional men will be required to complete double the work in 8 days ?
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- 28
- 21
- 14
- 7
Correct Option: C
| ∴ |  | : : 7 : x | 8 : 12 |
where, x is no. of men
⇒ 1 × 8 × x = 2 × 12 × 7
| ⇒ x = | = 21 | 8 |
∴ Number of additional men
= 21 – 7 = 14
Metod 2 :
Using Rule 1,
M1D1W2 = M2D2W1
⇒ 7 × 12 × 2 = M2 × 8 × 1
| ⇒ M2 = | = 21 | 8 |
∴ No. of additional men
= 21 – 7 = 14
