Question 473566
Since the average of the first 6 scores was 12, the sum of the 6 scores was 72.
We know that because the average = sum / count.
12 = x / 6
72 = x
x = 72
.
Using the same logic we find that
36 = y / 12
y = 12 * 36
y = 432
.
So, we have 18 scores that sum to 72+432 = 504
Average = 504/18
Average = 28.
.
Done.