The average of 16 numbers is 23. The average of the first 7 numbers is 21 and that of the last 8 numbers is 24. Find the 8th number.
Answer & explanation
Correct answer: option 3
Sum of 16 numbers = 16 x 23 = 368
Sum of first 7 numbers = 7 x 21 = 147
Sum of last 8 numbers = 8 x 24 = 192
8th number = 368 - 147 - 192 = 29