Question 290970

Let:
J = Joe
M = Jim 

J + M = 90 
M = 90 - J 
{{{ J + 6 = cross(2(M + 6)) = 2M + 12  }}}  Substitute (90 - J) for M
{{{ J = cross(2(90 - J) + 6) = 180 - 2J + 6 }}} 
{{{ J + 2J = 186 }}} <br>
{{{ 3J/3 = 186/3 }}}
J = 62
90 - 62 = 38<br>
Joe = 62, Jim = 38 

and bob's your uncle!