Which story problem could be solved using the division problem 30 รท 5 = 6?

There are 30 chairs in 5 rows. How many chairs are in each row?
There are 30 chairs in 6 rows. How many chairs are in each row?
There are 5 rows with 6 chairs. How many more rows are needed?
There are 30 chairs in 5 rows. How many more rows are needed?