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If 3 men or 4 women can plough a field in 43 days, how long will 7 men and 5 women take to plough it ?
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- 10 days
- 11 days
- 9 days
- 12 days
Correct Option: D
∵ 3 men = 4 women
| ∴ 1 man = | women | 3 |
| ∴ 7 men = | = | women | ||
| 3 | 3 |
| ∴ 7 men + 5 women = | + 5 | 3 |
| = | = | women | ||
| 3 | 3 |
Now, M1D1 = M2 D2
| ⇒ 4 × 43 = | × D2 | 3 |
Aliter : Using Rule 12,
Here, A = 3, B = 4, a = 43
A1 = 7 and B1 = 5
| Time taken = | A1B + B1A |
| = | = 12 days | 43 |
