Average Practice Test 7

Question : 1 of 22

Marks: +1, -0

The average age of a class is 35 years. Six new students with an average age of 33 years joined in that class, thereby decreasing the average by half-year. The original strength of the class was:

Validate

Solution:

Average age of the class = 35 years
Total age of class = 35x
Average age of 6 new students = 33 years
Total age of students = 33 × 6 = 198 years
According to the statement,
Original strength

={35x+198}/{x+6}=34 1/2

{35x+198}/{x+6}=69/2

70x+396=69x+414

x=18

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