The average of five numbers is 15. If one number is 10, what is the average of the remaining four numbers?
Options:
A) 16
B) 17
C) 18
D) 19
Answer:
C) 18
Solution:
Total sum of the five numbers = Average x Number of numbers = 15 x 5 = 75. Sum of the remaining four numbers = Total sum – Known number = 75 – 10 = 65. Average of the remaining four numbers = Sum / Number = 65 / 4 = 16.25, which rounds up to 18.
