36 men can complete a piece of work in 18 days. In how many days will 27 men complete the same work?
12
18
22
24
Explanation:
Let the required number of days be $ x $.
Less men, More days (Indirect Proportion)
$\therefore$ 27 : 36 :: 18 : $ x $ $\Leftrightarrow$ 27 x $ x $ = 36 x 18
| $\Rightarrow x $ =$ \dfrac{36 \times 18}{27} $ |
$\Rightarrow x $ = 24.