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:

21=v+f v=20f 21=20f+f=21 f f=21/21=1 Eur v=20 f=20 1=20 eur

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