Exhibition

The teacher paid for 280 Kč for 4.A students for admission to the exhibition. How many students were on the exhibition?

Correct answer:

n =  28

Step-by-step explanation:

$$\begin{gathered} D(280)=\{1,2,4,5,7,8,10,14,20,28,35,40,56,70,140,280\} \\ 15\le n\le 39 \\ n=20\mathrm{\mid }28\mathrm{\mid }35 \end{gathered}$$

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