Answer:
330 hs
Step-by-step explanation:
If Alice sleeps an average of 9 hs and her cat sleeps an average of 20 hours each day we can say that her cat sleeps an average of 11 hours more per day than her.
If the cat sleeps 11 hours more than her per day, for getting the hours he sleeps more by month we just need to multiply the daily value by the number of days in a month. Thus,
30 * (11) = 330
So, her cat sleeps an average of 330 hours more than her in a month, which can be decomposed in 11 hours a day.
I hope it is understandable.
