Question 743624
Let {{{ x }}} = number of {{{ 23 }}} cent stamps
{{{ 9 - x }}} = number of {{{ 32 }}} cent stamps
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{{{ 23x + 32*( 9 - x ) = 252 }}} ( in cents )
{{{ 23x + 288 - 32x = 252 }}}
{{{ -9x = 252 - 288 }}}
{{{ -9x = -36 }}}
{{{ x = 4 }}}
{{{ 9 - x = 5 }}}
5 of her stamps are worth 32 cents
check answer:
{{{ 23x + 32*( 9 - x ) = 252 }}}
{{{ 23*4 + 32*( 9 - 4 ) = 252 }}}
{{{ 92 + 32*5 = 252 }}}
{{{ 92 + 160 = 252 }}}
{{{ 252 = 252 }}}
OK