Question 1064922
He saved {{{ x}}} dimes and {{{ x - 12 }}} quarters
{{{ 10x + 25*( x - 12 ) = 1100 }}} ( in cents )
{{{ 10x + 25x - 300 = 1100 }}}
{{{ 35x = 1400 }}}
{{{ x = 40 }}}
and
{{{ x - 12 = 40 - 12 }}}
{{{ x - 12 = 28 }}}
-------------------------
Marvin had 40 dimes and 28 quarters
-------------------------
check:
{{{ 10x + 25*( x - 12 ) = 1100 }}} 
{{{ 10*40 + 25*28 = 1100 }}} 
{{{ 400 + 700 = 1100 }}}
{{{ 1100 = 1100 }}}
OK