When Eva buys 8 packages of cookies 4 CZK left her. If she wanted to buy 10 packages, she would have to borrow 20 CZK. How much money has Eva in her wallet?

Correct result:

x =  100


8y = x-4
10y = x+20

8•y = x-4
10•y = x+20

x-8y = 4
x-10y = -20

x = 100
y = 12

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