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1. 36 men can complete a piece of work in 18 days. In how many days will 27 men complete the same work?

A. 12

B. 18

C. 22

D. 24

Solution:

Let the required number of days be x.
Less men, More days (Indirect Proportion)

\begin{aligned} ∴ 27 : 36 :: 18 : x \\ \Rightarrow 27 \times x = 36 \times 18 \\ \Rightarrow x = \frac{36 \times 18}{27} \\ \Rightarrow x = 24 \end{aligned}

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