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1ejer. ----> 7/12 h
18ejer --->x
x=18*7/12
x=126/12
x=21/2 horas
rta: se demoras 21/2 horas en resolver los 18 ejercicios.
7/12=35min
18*35=630min
630/60= 10.5 horas para resolver los 18 problemas