Question:The average weight of `29` students is `28` kg. By the admission of a new student,the average weight is resuced to `27.8 kg.The weight of the new student is : 

A `22 kg` 
B `21.6 kg` 
C `22.4 kg` 
D `21 kg` 

+ Answer
A 

+ Explanation
Weight of the new student

`= (3 xx 27.8 - 29 xx 28) kg`

`= 22 kg`.

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Irin Moni

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