Question 611169
Let {{{ x }}} = number of dimes
Let {{{ x }}} = number of nickels
Let {{{ x }}} = number of quarters
given:
{{{ 840 = 5x + 10x + 25x }}} ( in cents )
{{{ 840 = 40x }}}
{{{ x = 21 }}}
He has 21 of each kind of coin