Question:The average of six numbers is `30`.If the average of first four is `25` and that of last three is `35`,the fourth number is : 

A `25` 
B `30` 
C `35` 
D `40` 

+ Answer
A 

+ Explanation
Fourth number 

`= (4 xx 25 + 3 xx 35 - 6 xx 60)`

`= 25`

+ Report

Irin Moni

Editor, VCampus

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