Question:Out of four numbers, the average of first three is `16` and that of the last three is `15`.If the last numbers is `18`the fisrt number is : 

A `20` 
B `21` 
C `23` 
D `25` 

+ Answer
B 

+ Explanation
Sum of 2nd & 3rd number

`= (3 xx 15 -18)`

`= 27`

:. First number

`= (3 xx 16 - 27)`

`= 21`.

+ Report

Irin Moni

Editor, VCampus

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