The average weight of 20 students in a class increased by 5.75 kg when one of the students left the class but when a new student joined the class then the average weight decreased by 2.75 kg. What is the difference between the age of the new student who joined the class and the student who left the class?

The average weight of 20 students in a class increased by 5.75 kg when

1.	The average weight of 20 students in a class increased by 5.75 kg when one of the students left the class but when a new student joined the class then the average weight decreased by 2.75 kg. What is the difference between the age of the new student who joined the class and the student who left the class?
A.	51.5 kg
B.	51.25 kg
C.	51.75 kg
D.	51 kg
E.	None of the above
Answer» B. 51.25 kg

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