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?

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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?

A57.5

B58

C69

D58.5

Answer:

C. 69

Read Explanation:

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

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