Question

2 hambúrgueres + 1 refrigerante =R$ 18,00 1 hambúrguer + 2 refrigerantes =R$13,20

Answer 1

2H + 1R = 18,00
+
1H + 2R = 13,20
--------------------------
3H + 3R = 31,20

H + R = 31,20 / 3

H + R = 10,40  → H = 10,40 - R


1H + 2R = 13,20

10,40 - R + 2R = 13,20

R = 13,20 - 10,40  →              R = 2,80    REFRIGERANTE

H = 10,40 - 2,80  →   H = 7,60    HAMBÚRGUER