The mean (average) of 6,9 and 18 is equal to the mean (average) of 12 and y. What is the value of y?
Answer Choices
A. 22
B. 21
C. 10
D. 11
E. 5
The mean (average) of 6,9 and 18 is equal to the mean (average) of 12 and y. What is the value of y?
Answer Choices
A. 22
B. 21
C. 10
D. 11
E. 5