Question:The average height of `30`boys out of a class of `50`,is `160`cm.If the average hieght of the remaining boys is `165`cm, the average height of the whole class (in cm) is : 

A `161` 
B `162` 
C `163` 
D `164` 

+ Answer
B 

+ Explanation
Required average 

`= ((30 xx 160 + 20 xx 165)/50)`

`= 162 cm`.

+ Report

Irin Moni

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