The period is 11
Explanation
6+5+10= 22 (ignore this i have to have 20 characters to submit this answer )
Answer:
28
Step-by-step explanation:
you add 21, 4, and 3 to find the total
then you find how many are white or gray
7/28= 1/3
1/3 times 84
84 times 1 divided by 3
84/3
