Question 1121461
how old is a boy if his years is average of his mother's years and his father is five years older than his mother and their age altogether is hundred years. 
<pre>{{{highlight_green(matrix(1,2, 19, "years-old"))}}}
I took the average of his mother's age to mean {{{1/2}}} his mother's age, or his mother being twice his age, which somehow doesn't make sense since an average 
usually includes at least 2 expressions. Nonetheless, that's how I arrived at the above answer. 
You need to better state a math problem if your desire is to get sensible answers, unless of course that's the way the problem was stated to you, which I somewhat doubt!