Brooke has set up 70 chairs in equal rows for the class talent show. But, there is not room for more than 20 rows. What are the possible number of rooms that Brooke could set up? Mathematics

 If the rows must be even, she can set

14 rows of 5 chairs

10 rows of 7 chairs

7 rows of 10 chairs  or

5 rows of 14 chairs

Step-by-step explanation:

Take the prime factors of 70: 2, 5 and 7  Multiply  them in different ways to get the combinations where no product is greater than 20. (7 ×5 is the one combination of factors that won't work)

answer is c

step-by-step explanation:

81/12=324/x

x=48