Question 1198048
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The original mixture is 1700 pounds, of which 25%, or 425 pounds, is corn.<br>
Add x pounds of corn to the mixture; there are now 425+x pounds of corn, with a total of 1700+x pounds of mixture.<br>
When that has been done, the corn is 40% (=2/5) of the mixture:<br>
{{{(425+x)/(1700+x)=2/5}}}
{{{5(425+x)=2(1700+x)}}}
{{{2125+5x=3400+2x}}}
{{{3x=1275}}}
{{{x=425}}}<br>
ANSWER: 425 pounds<br>