Jayden prepared 8 kilograms of dough after working 2 hours. How many hours did Jayden work if he prepared 36 kilograms of dough? Solve using unit rates.
If Jayden prepared 8 kilograms of dough after working 2 hours, then his unit rate of dough preparation is 8 kilograms per 2 hours, or 4 kilograms per hour.
Therefore, to prepare 36 kilograms of dough, Jayden would have to work for 36 kilograms / 4 kilograms per hour = <<36/4=9>>9 hours. Answer: \boxed{9}.