Solution :

Let there be $x$ men originally.Now, $x$ men finish the work in 28 days$\Rightarrow 1$ man can finish it in $28 x$ days Again, $(x+10)$ men finish the work in $(28-8)=20$ days$\Rightarrow 1$ man finishes the work in$20(x+10)$ daysFrom the question,$$\begin{aligned}& 28 x=20(x+10) \\\Rightarrow & 28 x=20 x+200 \\\Rightarrow & 28 x-20 x=200 \\\Rightarrow & 8 x=200 \\\therefore & x=\frac{200}{8}=25 \text { men; Ans. }\end{aligned}$$

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