Given that the average of 8 numbers is 5, what is the average of 9 numbers composed of 8 numbers and 5 numbers?

Given that the average of 8 numbers is 5, what is the average of 9 numbers composed of 8 numbers and 5 numbers?

Eight numbers, a total of 8x5 = 40
Then the average of 9 numbers is (40 + 5) / 9 = 5