The average of five numbers is 12. If one number is 18, what is the average of the remaining four numbers - mathselab.com

The average of five numbers is 12. If one number is 18, what is the average of the remaining four numbers?

Question:

The average of five numbers is 12. If one number is 18, what is the average of the remaining four numbers?



Options:

A) 8.5 
B) 9.5 
C) 10.5 
D) 11.5



Answer:

C) 10.5



Solution:

The sum of five numbers is 5 * 12 = 60. If one number is 18, the sum of the remaining four numbers is 60 – 18 = 42. Therefore, the average of the remaining four numbers is 42 / 4 = 10.5.

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