Answer:
72
Step-by-step explanation:
You need to find the average of all the number. However, you are given two averages that have unequal numbers. To solve, you need to multiply each average by the amount of number it has in it.
90 × 60 = 5400
60 × 90 = 5400
You need to find the total amount of number as well as the total value of the numbers.
90 + 60 = 150
5400 + 5400 = 10800
Divide the total value by the total amount of number to find the average.
10800/150 = 72
The total average is 72.
