You are given a math word problem and you are supposed to apply multiplication or division mathematical operators on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Sandy worked 45 hours in the last 5 days . Assuming that she worked the same amount of hours each day , how long did she work each day ?
9

Diana has 3840 erasers . If she shares them among 48 friends , how many erasers does each friend get ?
80

Each banana costs $ 5 . How much do 4 bananas cost ?

20