Question 996093
g, Greg
f, Father
m, Mother


{{{system(g=f/3,f=m+2)}}}


Greg was born some x years before now.
{{{f-x+m-x=46}}}
{{{f+m-2x=46}}}



Note that Greg was born  {{{f/3}}} years ago.
The age sum is then  {{{(f-f/3)+(m-f/3)=46}}}.
Working with this gives the equivalent,  {{{f+3m=138}}}.


You can use the system of equations
{{{highlight(system(g=f/3,f=m+2,f+3m=138))}}}.