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There are 50 students in a class. Their average weight is 45 kg. When one student leaves the class the average weight reduces by 100g. What is the weight of the student who left the class ?
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- 45 kg
- 47.9 kg
- 49.9 kg
- 50.1 kg
- 45 kg
Correct Option: C
Given that , The average weight of 50 students = 45 kg.
Total weight of 50 students = 50 × 45
On leaving the class by one student the average weight reduces by = 100 gm
Total weight of 49 students = 49 × 44.9
∴ Weight of the student who left = 50 × 45 – 49 × 44.9
Weight of the student who left = 2250 – 2200.1 = 49.9 kg.
