document.write( "Question 1183921: a:b=2:5 and a:c=3:7. What is c:b?
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Algebra.Com's Answer #814413 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
a:b=2:5 and a:c=3:7. What is c:b?
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document.write( "Product of the means equals the product of the extremes:\r\n" );
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document.write( "5a = 2b and 7a = 3c\r\n" );
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document.write( "\"system%285a=2b%2C7a=3c%29\"\r\n" );
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document.write( "Dividing equals by equals:\r\n" );
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document.write( "\"%285a%29%2F%287a%29=%282b%29%2F%283c%29\"\r\n" );
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document.write( "\"%285cross%28a%29%29%2F%287cross%28a%29%29=%282b%29%2F%283c%29\"\r\n" );
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document.write( "\"5%2F7=%282b%29%2F%283c%29\"\r\n" );
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document.write( "Cross-multiply:\r\n" );
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document.write( "\"15c=14b\"\r\n" );
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document.write( "\"c%2A15=b%2A14\" Make c and 15 the extremes, and 14 and b the means:\r\n" );
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document.write( "\"c%3Ab=14%3A15\"\r\n" );
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document.write( "Edwin
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