document.write( "Question 386243: A 400 gram solution is 25% salt. How much salt must be added to produce a solution that is 40% salt? \n" ); document.write( "
Algebra.Com's Answer #273089 by stanbon(75887)\"\" \"About 
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A 400 gram solution is 25% salt. How much salt must be added to produce a solution that is 40% salt?
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\n" ); document.write( "Quantity: x + y = 400
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\n" ); document.write( "Salt Eq:: 0.25x + y = 0.40*400
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\n" ); document.write( "Multiply Quantity thru by 25
\n" ); document.write( "Multiply Salt by 100
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\n" ); document.write( "25x + 25y = 25*400
\n" ); document.write( "25x + 100y = 40*400
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\n" ); document.write( "75y = 15*400
\n" ); document.write( "y = 80 gram (amt. of salt that must be added)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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