Question
The average age of (x + 2) students of a class is 14 years.
If the 56 years old class teacher is also included then average age of the class gets increased by three years. Find x% of 200.Solution
Total age of students = 14(x + 2) years
According to question,
[14(x + 2) + 56] = (14 + 3)(x + 2 + 1)
14x + 28 + 56 = 17x + 51
17x – 14x = 84 – 51
x = 11
So, 11% of 200 = 22
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