Question 552472
Let {{{ x }}} = number of $5 bills he has
{{{ 12 - x }}} = number of $1's he has
given:
{{{ 12 - x = 2x }}}
(1) {{{ 3x = 12 }}}
His amount of money is:
(2) {{{ 1*( 12 - x ) + 5x }}}