Question 824652
Let {{{ t }}} = his age now
{{{ t + 17 }}} = his age in 17 years
{{{ t - 7 }}} = his age 7 years ago
-----------------------------
given:
{{{ t + 17 = 3*( t-7 ) }}}
{{{ t + 17 = 3t - 21 }}}
{{{ 2t = 17 + 21 }}}
{{{ 2t = 38 }}}
{{{ t = 19 }}}
Timothy is 19 now