document.write( "Question 766832: If four litres of petrol containing 15% kerosine are added to another 7 litres of petrol containing 10% kerosine, what percentage of the petrol is kerosine? \n" ); document.write( "

Algebra.Com's Answer #467248 by Edwin McCravy(20056) $\"\"$ $\"About$

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If four litres of petrol containing 15% kerosine are added to another 7 litres of petrol containing 10% kerosine, what percentage of the petrol is kerosine.
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document.write( "The four litres are not pure petrol. They contain:\r\n" );
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document.write( "1.  15% of 4 litres or (.15)(4) = 0.6 litres of kerosine\r\n" );
document.write( "and\r\n" );
document.write( "2.  4.0 - 0.6 = 3.4 litres of petrol\r\n" );
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document.write( "Similarly, the 7 litres that are added are not pure petrol either.\r\n" );
document.write( "They contain:\r\n" );
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document.write( "1.  10% of 7 litres or (.10)(7) = 0.7 litres of kerosine\r\n" );
document.write( "and\r\n" );
document.write( "2.  7.0 - 0.7 = 6.3 litres of petrol\r\n" );
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document.write( "So the final mixture of 4+7 or 11 litres of liquid contains 0.6+0.7=1.3\r\n" );
document.write( "litres of kerosine.  So the fraction of kerosine is\r\n" );
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document.write( "1.3 litres\r\n" );
document.write( "---------- = ·100% = ·100% = % = % \r\n" );
document.write( " 11 litres\r\n" );
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document.write( "Edwin

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