Question
The average age of (x + 3) students of a class is 12 years.
If the 42 years old class teacher is also included then average age of the class gets increased by one year. Find x% of 400.Solution
Total age of students = 12(x + 3) years
According to question,
[12(x + 3) + 42] = (12 + 1)(x + 3 + 1)
12x + 36 + 42 = 13x + 52
13x – 12x = 78 – 52
x = 26
So, 26% of 400 = 104
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