The average of 12 numbers is 49.5. The average of the first 5 numbers is 45, and the average of the next 4 numbers is 53.25. What is the average of the remaining three numbers?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 52.
Total = 12 × 49.5 = 594
Sum of first 5 = 5 × 45 = 225
Sum of next 4 = 4 × 53.25 = 213
Sum of last 3 = 594 − 225 − 213 = 156
Average of last 3 = 156 ÷ 3 = 52