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h-12 = d+12
(1.8*d) - 12 = d+12
(1.8-1)*d = 12+12 = 24
d*0.8 = 24
d = 24/0.8 = 30
h = 1.8*30 = 54
comprobación:
54-12 = 30+12
Respuesta:
John: 54 soles
Nayda: 30 soles