Answer:
54
Explanation:
You want the mean of the positive 2-digit multiples of 4.
Mean
The 2-digit multiples of 4 form an arithmetic sequence whose first term is 12, and whose last term is 96. The arithmetic mean of the numbers in the sequence will be the average of the first and last numbers:
(12 +96)/2 = 108/2 = 54
The average of the 2-digit multiples of 4 is 54.