Question

 Average of 24 numbers is 26. The average of first 15 numbers is 23 and last eight numbers is 33. Find the 16^th number.
1. 15
2. 13
3. 16
4. 18

Answer 1

Correct Answer - Option 1 : 15

Given

Average of 24 numbers is 26. The average of first 15 numbers is 23 and last eight numbers is 33. 

Concept used

Average

Calculation

Sum of first 15 numbers = 15 × 23 = 345

Sum of last eight numbers = 8 × 33 = 264

Sum of 24 numbers = 24 × 26 = 624

16^th number = 624 - (345 + 264)

16^th number = 624 - 609 = 15