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

Correct answer:

x =  100

Step-by-step explanation:

8y=x4 10y=x+20  8 y=x4 10 y=x+20  x8y=4 x10y=20  Row2Row1Row2 x8y=4 2y=24  y=224=12 x=4+8y=4+8 12=100  x=100 y=12

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