Salary

Lawyer got to pay 840 Euros in banknotes of 20 and 50 Eur. Total got 18 banknotes. How many was which?

Correct answer:

€ 20 :  2
€ 50 :  16

Step-by-step explanation:

$$\begin{gathered} 20x+50y=840 \\ x+y=18 \\ x=2 \\ y=16 \end{gathered}$$

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