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A wall of 100 metres can be built by 7 men or 10 women in 10 days. How many days will 14 men and 20 women take to build a wall of 600 metres ?
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- 15
- 20
- 25
- 30
Correct Option: A
Using Rule 1,
7 men ≡ 10 women
| or 1 man | women | 7 |
14 men + 20 women
| = |  | + 20 |  | women | 7 |
= 40 women
Now, more work, more days
More women, less days
 | : : 10 : x | Women 40 : 10 |
Where x = number of days
⇒ 1 × 40 × x = 6 × 10 × 10
| or x = | = 15 | 40 |
