Question : There are 15 students in a class. Their average weight is 40 kg. When one student leaves the class, the average weight is 39.5 kg. What is the weight of the student who left the class (where kg means kilogram)?
Option 1: 47 kg
Option 2: 42 kg
Option 3: 52 kg
Option 4: 48 kg
Correct Answer: 47 kg
Solution :
Given: There are 15 students in a class. Their average weight is 40 kg.
Before one student left, the combined weight of the class was: 15 × 40 = 600 kg
After one student left the class, the remaining student's combined weight = 14 × 39.5 = 553 kg
The weight of the student who left the class = 600 – 553 = 47 kg
Hence, the correct answer is 47 kg.
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