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lo unico que debes hacer es multiplicar en aspa
b.- 5/3 de 90 = 5/3x90 = 450/3 = 150
c.- 4/9 de 120 = 4/9x120 = 480/9 = 160/3
d.- 11/12 de 480 = 11/12x480 = 5280 / 12 = 440