document.write( "Question 770717: If f(x)=x and g(x)=2x-3 find (f•g)(x) \n" ); document.write( "
Algebra.Com's Answer #469709 by stanbon(75887)\"\" \"About 
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how many ounces of pure silver should be added to 180 ounces, 75% pure, to obtain a mixture of 80% pure?
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\n" ); document.write( "Equation:
\n" ); document.write( "silver + silver = silver
\n" ); document.write( "1.00x + 0.75*180 = 0.80(x+180)
\n" ); document.write( "100x + 75*180 = 80x + 80*180
\n" ); document.write( "20x = 5*180
\n" ); document.write( "x = 180/4
\n" ); document.write( "x = 45 ounces (amt. of pure silver to add)
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\n" ); document.write( "the second question is:
\n" ); document.write( "how many pounds of cream containing 30% butterfat should be added to 500 pounds of milk containing 2% butterfat to give milk containing 3.5% butterfat?
\n" ); document.write( "Equation:
\n" ); document.write( "fat + fat = fat
\n" ); document.write( "0.30x + 0.02*500 = 0.035(x+500)
\n" ); document.write( "300x + 20*500 = 35x + 35*500
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\n" ); document.write( "265x = 15*500
\n" ); document.write( "x = 28.3 lbs (amt. of 30% butter fat to add)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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