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

Correct result:

f =  1 Eur


21=v+f v=20f 21=20f+f=21 f f=21/21=1 Eur v=20 f=20 1=20 eur21=v+f \ \\ v=20f \ \\ 21=20f +f=21 \ f \ \\ f=21/21=1 \ \text{Eur} \ \\ v=20 \cdot \ f=20 \cdot \ 1=20 \ \text{eur}

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