Answer: D.
Step-by-step explanation:
X+6
6543 divided by 3 = 2181 followers per group
If the measure of each exterior angle is 24, the measure of each interior angle is then 180-24=156
the sum of the interior angles of a polygon is (n-2)*180, n is the number of sides
(n-2)*180=156*n
180n-360=156n
24n=360
n=15
the polygon has 15 sides
Fill in the values and calculate:
1/4 * 6 + 3*7 = 6/4 + 21 = 22 1/2