Question

The average age of a group of persons going for tour to Shimla is 22 years. 30 new persons with an average age of 8 years join the group and their average age becomes 12 years. The number of persons initially going for tour is?

A 4 yrs Correct Answer Incorrect Answer
B 2 yrs Correct Answer Incorrect Answer
C 6 yrs Correct Answer Incorrect Answer
D 12 yrs Correct Answer Incorrect Answer
E 10 yrs Correct Answer Incorrect Answer

Solution

Initial number of persons = x 22x + (30 x 8) = 12(x + 30) 22x - 12x = 360 - 240 10x = 120 x = 12

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