The average (mean) of 90 numbers is 60, and the average of 60 numbers is 90. What is the average of all the numbers? I will mark brainliest for the best explanation

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.

Answer: 72

Step-by-step explanation:

Total Score of 90 nos

90 x 60 = 5400

Total score of 60 nos

60 x 90 = 5400

Average of (90 + 60) = 10800 / 150 = 72