Question:In seven given numbers ,the average of first four numbers is `4` and that of the last four numbers is also `4`.If the average of these seven numbers is `3`, the fourth number is : 

A `3` 
B `4` 
C `7` 
D `11` 

+ Answer
D 

+ Explanation
Fourth number 

`= (4 xx 4 + 4 xx 4 - 7 xx 3)`

`= 11`

+ Report

Irin Moni

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