Question
The average weight of 20 boys is 60 kg and the average weight of 30 girls is 55 kg. Find the average weight of all 50 students together.
Solution
Total weight of boys = 20 × 60 = 1,200 kg Total weight of girls = 30 × 55 = 1,650 kg Combined total = 1,200 + 1,650 = 2,850 kg Total students = 20 + 30 = 50 Average = 2,850 / 50 = 285/5 = 57 kg Answer: 57 kg.
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