Each chair

Each chair costs twice less than two tables. One table costs 720 Czech crowns. How many crowns are the table and 4 chairs?

Correct result:

x =  3600 Kc

Solution:

$$\begin{gathered} s=720\text{ kc } \\ z=2\cdot s\mathrm{/}2=2\cdot 720\mathrm{/}2=720\text{ Kc } \\ x=s+4\cdot z=720+4\cdot 720=3600\text{ Kc} \end{gathered}$$

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