Luisito cría 70 aves entre patos , gallinas y pavos .Los 2/5 del total son patos ,los 3/7 son gallinas .¿Cuántos pavos cría Luisito?
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Total = 70
Patos= 2/5 de 70 = 28
Gallinas= 3/7 de 70 = 30
Pavos= x
28 + 30 + x = 70
58 + x = 70
x = 70 - 58
x = 12
Respuesta: 12 pavos