document.write( "Question 880754: The minimum standard for a shipment of gravel is that 85 percent of the gravel should drop through a screen of a certain size. One load of 6 cubic yard testes at only 65 percent. How much gravel testing at 90 percent must be added to the 65 percent load to make it acceptable?
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Algebra.Com's Answer #531667 by josgarithmetic(39630) $\"\"$ $\"About$

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Mixture Problem using percents.\r
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\n" ); document.write( "\n" ); document.write( "Assigning variables,
\n" ); document.write( "Q = 6 cubic yards of gravel
\n" ); document.write( "L = 65, % which falls through screen
\n" ); document.write( "T = 85, % which needs to fall through screen
\n" ); document.write( "H = 90, % which can fall through screen, the quality of material to add
\n" ); document.write( "y = volume of the H material to add to reach T\r
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\n" ); document.write( "\n" ); document.write( "Develop this equation.
\n" ); document.write( " $\"highlight%28%28LQ%2BHy%29%2F%28Q%2By%29=T%29\"$ .
\n" ); document.write( "Solve this symbolically for y.
\n" ); document.write( "Substitute the assigned other variable values.
\n" ); document.write( "Compute y.\r
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\n" ); document.write( "\n" ); document.write( "Here is a full lesson on this kind of mixture problem:
\n" ); document.write( "Mixture: one material quantity unknown \n" ); document.write( "

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