Question

The average age of a set of 30 persons is 35. The average of 20 persons is 18. What will be the average of the remaining?

• A. 57.5
• B. 58
• C. 69
• D. 58.5

Answer 1

Answer:

C. 69

Total age of 30 persons = 30 x 35 = 1050 Total age of 20 persons = 20 x 18 = 360 The age of remaining = 1050 - 360 = 690 The average age of remaining 10 persons = 690 ÷ 10 = 69