Question 1001862
m for ToM, d for TodD

Half of the work is to write the system of equations.
{{{system(m/d=4,m+6=10+2(d+6))}}}


Simplify the system.
{{{system(m=4d,m+6=2d+12+10)}}}
{{{system(m=4d,m+6=2d+22)}}}
{{{highlight_green(system(m=4d,m=2d+16))}}}


Two formulas for m in terms of d.
Easy; equate the expressions, solve for d.


{{{highlight(system(d=8,m=4))}}}