there are 115 seats in a conference room. There are 5 seats in each row. There are 100 people seated, filling up full rows of seats. How many rows are empty?

There are 3 empty rows.

Step-by-step explanation:

There are 115 seats.

There are 100 people seated.

115 - 100 = 15

There are 15 empty seats.

There are 5 seats in each row.

15/5 = 3

There are 3 empty rows.