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joge = 10 de fruta + 4 gelatinas = 252 pesitos
por sistema de ecuaciones:
9F + 10G = 278
10F + 4G = 252
multiplico para igualar:
(9F + 10G = 278) × 10
(10F + 4G = 252) × 9
pa finalizar:
90F + 100G = 2780
90F + 36G = 2268
RESTO Y ELIMINO 90F:
64G = 512 ⇒ G = 8 y luego reemplazo en la ecuacion para hallar F= 22