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3²/₃ = 11/3
5³/₄ = 23/4
Sumamos
11/3 + 23/4 + 6 convertimos a doceavos
44/12 + 69/12 + 72/12 = 185/12 = 15⁵/₁₂
Los tres han estudiado 15⁵/₁₂ horas
15 horas 25 minutos
o
15 5/12 de horas
porque por cada
1/3=20minutos
1/4=15minutos