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10/10-3/10 = 7/10
restan 7/10
4/7 de 7/10:
(4/7) * (7/10) = 4/10
4/10 segundo día
3/10+4/10 = 7/10
el primer día y el segundo día, ha resuelto:
7/10 del total
10/10-7/10 = 3/10
le faltan por resolver:
3/10
30*3/10 = 90/10 = 9
Le faltan por resolver 9 problemas.
Saludos...............