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3 maletines = $35
5 maletines = x
(5)*(35)/(3) = 175/3
.......
8 libros = 175/3
6 libros = x
(6)*(175/3)/(8) = 350/8
.......
14 cuadernos = 350/8
16 cuadernos = x
(16)*(350/8)/(14) = (700/14) = 50
16 cuadernos cuestan $50