document.write( "Question 1132751: A chemistry experiment calls for one liter of sulfuric acid at a 15% concentration, but the supply room only
\n" ); document.write( "stocks sulfuric acid in concentrations of 10% and 35%.
\n" ); document.write( "How many liters of each should be mixed to give the acid needed for the experiment?
\n" ); document.write( "How many liters should be mixed to give two liters at a 15% concentration? \n" ); document.write( "
Algebra.Com's Answer #749907 by greenestamps(13200)\"\" \"About 
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\n" ); document.write( "Here is an alternative to the traditional algebraic method for solving problems like this involving a mixture of two ingredients.

\n" ); document.write( "The desired concentration is 15%; the two ingredients are 10% and 35%.

\n" ); document.write( "Think of starting with some amount of the 10% and adding the 35%, stopping when the desired 15% concentration is achieved. The question then is when to stop adding the higher concentration acid.

\n" ); document.write( "(1) 15% is 1/5 of the way from 10% to 35%. (15%-10% = 5%; 35%-10% = 25%; 5/25 = 1/5)

\n" ); document.write( "(2) That means 1/5 of the mixture needs to be the 35% ingredient.

\n" ); document.write( "ANSWER: 1/5 of the liter is the 35% acid; the other 4/5 of the liter is the 10% acid. \n" ); document.write( "
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