There are 112 seats in the school auditorium. there are 7 seats in each row. there are 70 people seated, filling up rows of seats. how many rows are empty

Now, to find how many people are not there, all you have to do is subtract the amount of seats and the people there.
112- 70= 42
Now since there are 7 seats per row and 42 is divisible by 7, you can divide 42 by 7.
42÷7= 6
So, 6 rows were empty.