Question
The average weight of 25 boys in a class is 60 kg and
the average weight of 15 girls is 50 kg. Find the average weight of all the students together.Solution
Total weight of boys = 25 × 60 = 1,500 kg Total weight of girls = 15 × 50 = 750 kg Combined total weight = 1,500 + 750 = 2,250 kg Total number of students = 25 + 15 = 40 Combined average weight = 2,250 / 40 Simplify: 2,250 ÷ 40 = 225 ÷ 4 = 225/4 kg Answer: 225/4 kg (i.e., 56¼ kg).
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