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4a+5n=570...(x6)⇒24a+30n=3420...(II)
I-II⇒ 2n=100
n=50
Reemplaza en II
24a+30*50=3420
24a+1500=3420
24a=1920
a=80
⇒LA ENTRADA DE UN NIÑO CUESTA 50 Y LA DE UN ADULTO 80.