There are 50 students in a class. Their average is 45 kg. When one student leaves the class the average weight reduces by 100 gram. What is the weight of the student who left the class?



[ A ]    45 kg
[ B ]    47.9 kg
[ C ]    49.9 kg right
[ D ]    50.1 kg
Answer : Option C
Explanation :
ATQ,
The weight of students who left the class
= 45 + $49X100\over1000$
= 45 + 4.9
= 49.9 kg

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