The average of 13 numbers is 60. Average of the first 7 of them is 57 and that of the last 7 is 61. Find the 7th number?
Q1. The average of 13 numbers is 60. Average of the first 7 of them is 57 and that of the last 7 is 61. Find the 7th number?
Answer: 46
Explanation: Sum of 13 numbers = 780; sum of first 7 = 399; sum of last 7 = 427; 7th number = 399 + 427 − 780 = 46.