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If the work done by (x –1) men in (x + 1) days is to the work done by (x + 2) men in (x – 1) days are in the ratio 9 : 10, then the value of x is equal to :
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- 5
- 6
- 7
- 8
Correct Option: D
Using Rule 1,
| = | ||||
| W1 | W2 |
| ∴ | = | |||
| W2 | M2D2 |
| ∴ | = | = | ||||
| 10 | (x + 2)(x - 1) | x + 2 |
⇒ 10x + 10 = 9x + 18
⇒ x = 18 – 10 = 8
