Question 1154156
Let {{{ x }}} = number of pkgs reg batteries
{{{ 5 - x }}} = number of pkgs alkaline batteries
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{{{ 4.25x + ( 5 - x )*5.5 = 25 }}}
{{{ 4.25x + 27.5 - 5.5x = 25 }}
{{{ 1.25x = 2.5 }}}
{{{ x = 2 }}}
and
{{{ 5 - 2 = 3 }}}
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2 pks  reg batts
3 pkgs alk batts
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check:
{{{ 4.25x + ( 5 - x )*5.5 = 25 }}}
{{{ 4.25*2 + 3*5.5 = 25 }}}
{{{ 8.5 + 16.5 = 25 }}}
{{{ 25 = 25 }}}
OK