Question
The average age of (x + 6) students is 14 years. When a
36-year-old principal joins, the average age increases by 1 year. Find x% of 500.Solution
Total age of students = 14(x + 6)
According to question,
[14(x + 6) + 36] = (15)(x + 6 + 1)
14x + 84 + 36 = 15x + 105
15x - 14x = 120 - 105
x = 15
So, 15% of 500 = 75
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