In a class of 150 students (boys and girls only), the girls are 60. The average weight of boys is 52 kg and that of girls is 48 kg. What is the average weight (in kg) of the whole class?

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Accepted Answer

Step 1: Total number of students = 150
Step 2: Number of girls = 60
Step 3: Number of boys = 150 - 60 = 90
Step 4: Average weight of boys = 52 kg
Step 5: Average weight of girls = 48 kg

Step 6: Total weight of boys = 90 × 52 = 4680 kg
Step 7: Total weight of girls = 60 × 48 = 2880 kg

Step 8: Total weight of all students = 4680 + 2880 = 7560 kg
Step 9: Average weight of whole class = Total weight / Total number of students = 7560 / 150 = 50.4 kg

Therefore, the average weight of the whole class is 50.4 kg.

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