Question 1093112
------------------------------------------
Evan is 5 years older than Kathryn. 
------------------------------------------


v, Evan now
k, Kathryn now
{{{k=v-5}}}



-----------------------------------------------
In 8 years the sum of their ages will be 47.
-----------------------------------------------

{{{v+8+(v-5+8)=47}}}



---------------------------
How old is Evan now?
---------------------------

Just solve the previous equation.
{{{v+v+8+8-5=47}}}
{{{2v=47-16+5}}}
{{{2v=47-11}}}
{{{2v=36}}}
{{{highlight(v=18)}}}