SSC CGL – Combined Graduate Level Examination · Question 63
The average of 13 numbers is 75. If the average of the first six numbers is 69 and the average of the last six numbers is 80, what is the 7th number?
Show answer & explanation
Answer: (A) 81
Explanation
975 − 6×69 − 6×80 = 975 − 414 − 480 = 81.