Question
the average (arithmetic mean) of a and b is 6 and the average of a, b, c is 11. What is the value of c?
Answers
Reiny
(a+b)/2 = 6
a+b = 12
(a+b+c)/3 = 11
a+b+c = 33
12+c = 33
c = 21
a+b = 12
(a+b+c)/3 = 11
a+b+c = 33
12+c = 33
c = 21