document.write( "Question 926091: A petroleum company has two different sources of crude oil. The first source provides crude oil that is 20% hydrocarbons, and the second one provides crude oil that is 60% hydrocarbons. In order to obtain 160 gallons of crude oil that is 45% hydrocarbons, how many gallons of crude oil must be used from each of the two sources? \n" ); document.write( "
Algebra.Com's Answer #561973 by TimothyLamb(4379)\"\" \"About 
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x = gallons of 20%
\n" ); document.write( "y = gallons of 60%
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\n" ); document.write( "20x + 60y = 45*160
\n" ); document.write( "x + y = 160
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\n" ); document.write( "put the system of linear equations into standard form
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\n" ); document.write( "20x + 60y = 7200
\n" ); document.write( "x + y = 160
\n" ); document.write( "---
\n" ); document.write( "copy and paste the above standard form linear equations in to this solver:
\n" ); document.write( "https://sooeet.com/math/system-of-linear-equations-solver.php
\n" ); document.write( "---
\n" ); document.write( "answer:
\n" ); document.write( "x = gallons of 20% = 60
\n" ); document.write( "y = gallons of 60% = 100
\n" ); document.write( "---
\n" ); document.write( "Solve and graph linear equations:
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\n" ); document.write( "Solve systems of linear equations up to 6-equations 6-variables:
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