Question
The average age of a group of 9 teachers is 50 years.
When the principal retires, the average age of the remaining teachers drops to 45 years. Find the age of the principal.Solution
Let the age of the principal be ‘x’ years. So, x + (50 – 5) × 8 = 9 × 50 x + 45 × 8 = 450 x + 360 = 450 x = 450 – 360 x = 90 years So, age of the principal was 90 years.
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