MathDB

13

Part of 1999 AMC 8

Problems(1)

1999 AMC 8 #13

Source:

6/17/2011
The average age of the 40 members of a computer science camp is 17 years. There are 20 girls, 15 boys, and 5 adults. If the average age of the girls is 15 and the average age of the boys is 16, what is the average age of the adults?
(A) 26(B) 27(C) 28(D) 29(E) 30 \text{(A)}\ 26\qquad\text{(B)}\ 27\qquad\text{(C)}\ 28\qquad\text{(D)}\ 29\qquad\text{(E)}\ 30