Wine

A bottle of wine costs 21 euros; and wine is 20 times more expensive than a bottle. How much a bottle cost?

Correct answer:

f =  1 Eur

Step-by-step explanation:

$$\begin{gathered} 21=v+f \\ v=20f \\ 21=20f+f=21f \\ f=21\mathrm{/}21=1\text{ Eur } \\ v=20\cdot f=20\cdot 1=20\text{ eur} \end{gathered}$$

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