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B = ctd monedas de 5
Entonces
A + B = 35
10A + 5B = 290
Luego
10A + 5(35 - A) = 290
5A = 290 - 175 = 115
A = 115/5 = 23
Por tanto B = 35 - 23 = 12
Respuesta : Abril tiene 23 monedas de $10 y 12 monedas de $5