Here,

M₁ = 36, D₁ =24, W₂ =$1-\frac{2}{5}$

M₂ = 36+x, D₂ = 24, W₁ = $\frac{2}{3}$

So according to the formula,

     M₁ D₁ W₂ = M₂ D₂ W₁

$$\begin{gathered} \left(36\times 24\right) \left(1-\frac{2}{5}\right)=\left(36+x\right)\times 24\times \frac{2}{5} \\ 36\times 24\times \frac{3}{5}=\left(36+x\right)\times 24\times \frac{2}{5} \\ 36\times 3=2\left(36+x\right) \\ 108=72+2x \\ x=\frac{36}{2}=18 men \end{gathered}$$

Hence option A is correct