Question:The average of `5`numbers is `7`.When `3` new numbers are added ,the average of the eight numbers is `8,.5`The average of the three new numbers is : 

A `11` 
B `7.75` 
C `8.5` 
D `7` 

+ Answer
A 

+ Explanation
Sum of three new numbers

`= (8 xx 8.5 - 5 xx7)`

`= 33`

:. Thier average 

`= 33/3`

`= 11`

+ Report

Irin Moni

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