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⋅ f=20⋅ 1=20 eur=1  Eur 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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