Question
The average age of (x + 4) students is 14 years. When a
tutor aged 30 years is included, the average increases by 1 year. Find x% of 900.Solution
Total age of students = 14(x + 4) years According to question, [14(x + 4) + 30] = (14 + 1)(x + 4 + 1) 14x + 56 + 30 = 15x + 75 14x + 86 = 15x + 75 15x – 14x = 86 – 75 x = 11 So, 11% of 900 = 99
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