Glass

At the glass shop we have to cut 8 sheets of glass. Each was shaped a square with sides of 18 cm. We paid 44 CZK. How much is a 1 m² of glass?

Correct result:

x =  169.75 Kc

Solution:

$$\begin{gathered} a=18\text{ cm}\to \text{ m}=18\mathrm{/}100\text{ m}=0.18\text{ m } \\ {S}_1=a^2=0.18^2={\displaystyle \frac{81}{2500}}=0.0324{\text{m}}^2 \\ S=8\cdot S_1=8\cdot 0.0324={\displaystyle \frac{162}{625}}=0.2592{\text{m}}^2 \\ x=44\mathrm{/}S=44\mathrm{/}0.2592={\displaystyle \frac{13750}{81}}=169.75\text{ Kc} \end{gathered}$$

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