Q 1720501411.     The average weight of students in a class is `43 kg`. Four new students arc admitted to the class whose weights are `42 kg`, `36 kg` ,`39 kg` and `42.5 kg` , respectively . Now the weight of the student of the class is `42.5 kg.` The number of students in the begining was.

CDS 2015 Paper-2
A

`10`

B

`15`

C

`20`

D

`25`

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