Samantha sleeps an average of 8 hours a night. Her baby sister sleeps 2.5 times as much as Samantha does. Because her father is so tired from watching the baby, for every hour the baby sleeps, he sleeps 30 minutes. How many hours does her father sleep in a week? Let's think first. Chain of thought:
The baby sleeps 20 hours a day because 2.5 x 8 = 20. The baby sleeps 2 times as much as the father because 60 / 30 = 2. The father sleeps 10 hours a night because 20 / 2 = 10. The father sleeps for 70 hours a week because 7 x 10 = 70.
Therefore, the answer is 70.