Question 642011
he has {{{ x }}} dimes and {{{ 19 - x }}} quarters
given:
{{{ 10x + 25*( 19-x )  = 325 }}} ( in cents )
{{{ 10x + 475 - 25x = 325 }}}
{{{ -15x = 325 - 475 }}}
{{{ -15x = -150 }}}
{{{ x = 10 }}}
{{{ 19 - x = 19 - 10 }}}
{{{ 19 - x = 9 }}}
He has 10 dimes and 9 quarters
check:
{{{ 10*10 + 25*( 19-10 )  = 325 }}}
{{{ 100 + 25*9 = 325 }}}
{{{ 100 + 225 = 325 }}}
{{{ 325 = 325 }}}
OK