# Wine

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

Result

f =  1 Eur

#### Solution:

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

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