The average of 13 numbers is 48.5. The average of the first five numbers is 56.4, and that of the last nine numbers is 45.6. What is the 5th number?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 61.9.
Sum of 13 numbers = 13 × 48.5 = 630.5
Sum of first 5 = 5 × 56.4 = 282
Sum of last 9 = 9 × 45.6 = 410.4
5th number = 692.4 - 630.5 = 61.9