<PRE><B>Question 708795</B>
Let A = the present age of the man.
{{{2*(A - 12) = A + 12}}}
Multiply the 2 through
{{{2A - 24 = A + 12}}}
Add 24 to both sides
{{{2A = A + 36}}}
Subtract A from both sides
{{{highlight(A = 36)}}}
The man is currently 36.
12 years ago he was 24.
In 12 years he will be 48.
24 x 2 = 48</PRE>