Question 911540
My brother is 6
years older than me.Our age
combined is half my
grandfather's age...how old am
I?
<pre>
There is not enough information given.  Something was left out.
There are many possible solutions.  Most grandfathers become 
grandfathers at about age 48, so the most feasible answers are:

You are 14, your brother is 20, and your grandfather is 68.
You are 15, your brother is 21, and your grandfather is 72.
You are 16, your brother is 22, and your grandfather is 76.
You are 17, your brother is 23, and your grandfather is 80.
You are 18, your brother is 24, and your grandfather is 84.
You are 19, your brother is 25, and your grandfather is 88.
You are 20, your brother is 26, and your grandfather is 92.
You are 21, your brother is 27, and your grandfather is 96.
You are 22, your brother is 28, and your grandfather is 100.

Edwin</pre>