Question
The average weight of 30 students in a class increases
by 0.5 kg when the weight of the principal is included. If earlier the average weight of the students was 50 kg, then find the weight of the principal.Solution
ATQ, Total weight of the students (Excluding the weight of the principal) = 30 × 50 = 1500 kg New total weight of the students = 31 × (50 + 0.5) = 31 × 50.5 = 1565.5 kg So, weight of the principal = 1565.5 - 1500 = 65.5 kg
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