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5 tortas + 6 refrescos ------ $132
6 tortas + 7 refrescos ------ $157
1 torta + 1 refresco ------- $x
TODO ESTO ES IGUAL A:
11 -------- $132
13 ------- $156
2 --------- $x
x = 2·156/13 = 24.
ESTO ES IGUAL A:
11 ---------- $132
13 --------- $156
2 ---------- $24
Espero haber ayudado!!!¡¡¡