document.write( "Question 1165786: Petrolyn motor oil is a combination of natural oil and synthetic oil. It contains 7 liters of natural oil for every 5 liters of synthetic oil. In order to make 636 liters of Petrol oil, how many liters of natural oil are needed? \n" ); document.write( "

Algebra.Com's Answer #790255 by ikleyn(52803) $\"\"$ $\"About$

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document.write( "Let x be the number of these (7liters+5liters) portions in 636 liters of the mixture.  Then\r\n" );
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document.write( "    7x + 5x = 636\r\n" );
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document.write( "    12x     = 636\r\n" );
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document.write( "      x     = 636/12 = 53  portions.\r\n" );
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document.write( "ANSWER.  53*7 = 371 liter of the natural oil.\r\n" );
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