The average of eight numbers is 20. The average of five of these numbers is 15. The average of the remaining three numbers is

Correct option is D

Given:

Average of 8 numbers = 20

Average of 5 numbers = 15

Formula Used:

Sum of numbers = Average $$\times$$​Number of numbers

Solution:

Sum of 8 numbers = 20 $$\times$$​ 8 = 160

Sum of 5 numbers = 15$$\times$$5 = 75​

Sum of 3 numbers = Sum of 8 numbers - Sum of 5 numbers

Sum of 3 numbers = 160 - 75 = 85

Average of 3 numbers =$$\frac{\text{Sum of 3 numbers }}{ 3}$$​​

Average of 3 numbers = $$\frac{85}{ 3}$$​ = 28.33 (approximately)

Option (D) is right.