Question 807364
Whatever amount of flour you add to
the canister gets subtracted from the 
bag
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So, if you end up with {{{ 5026 + x }}}
grams of flour in the canister, then 
you must have {{{ 4157 - x }}} grams
of flour in the bag
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You are given that
( grams of flour in canister ) = ( 2x grams of flour in bag )
when you are done
So, now I can say
{{{ 5026 + x = 2*( 4157 - x ) }}}
{{{ 5026 + x = 8314 - 2x }}}
{{{ 3x = 8314 - 5026 }}}
{{{ 3x = 3288 }}}
{{{ x = 1096 }}}
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There is {{{ 4157 - x }}} flour left in the bag
{{{ 4157 - 1096 = 3061 }}}
There is 3,061 grams of flour left in the bag
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check answer:
{{{ 5026 + x = 5026 + 1096 }}}
{{{ 5026 + x = 6122 }}}
and
{{{ 4157 - x = 4157 - 1096 }}}
{{{ 4157 - x = 3061 }}}
and
{{{ 6122 = 2*3061 }}}
{{{ 6122 = 6122 }}}
OK