7 roses

Peter buys seven roses. When he paid for them, he had 4 euros left. If he had bought five roses, he would have 40 euros left. How many euros did Peter have before the purchase?

Correct answer:

x =  130 eur

Step-by-step explanation:

x = 5(x-4)/7+40

x = 5·(x-4)/7+40

2x = 260

x = 260/2 = 130

x = 130

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