Question:The average  of `25` result is `18`.The average of first twelve of them is `14`and that of  last twelve is `17`.The thirteenth result is : 

A `28` 
B `78` 
C `72` 
D `85` 

+ Answer
B 

+ Explanation
Thirteenth result

`= [25 xx 18 - (12 xx 14 + 12 xx 17)]`

`= 78`

+ Report

Irin Moni

Editor, VCampus

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