Question 889771
Let Jay's age be "J"
Greg's age be "G"

{{{J=3G}}}

{{{(J-6)+(G-6)=J}}}
{{{3G - 12 + G = 3G}}}
{{{G = 12}}}

{{{J=3(12)}}}
{{{J=36}}}

Therefore, Jay's age is 36 years old and Greg is 12.