Chairs need to be set up for the audience members. You want to use the fewest number of chairs and still meet these three additional conditions. • There are 21 rows of chairs. • There are the same number of chairs in each row. • There are an even number of chairs in each row. Based on the number of students expected to attend, design a plan to set up the chairs. State how many total chairs there are, and explain why your plan meets these conditions.​