Let's look at all the options:
A.Sixteen of the attendees were over the age of 50.
it was 6 until 60 years, then 3 until 70, 4 until 80, 1 until 90 ad 2 until 100: together 16, yes, correct answer!!
B. There were a total of 50 people in attendance.
Let's add up (from left to right): 8+5+10 (23 so far)+7+9 (39 so far-until 50) and then 16 that's 55 total: false:
C. Five less attendees were older than 40 than those 40 or younger.
False! there were 8 attendees under 10 and 16 over 50!
D.More than half of the attendees were between the ages of 21 and 50.
Between 21 and 50 there were 10+7+9=26, which is less than half of 55 - false!
