document.write( "Question 1062672: Karen collects local and foreign coins. Of the coins in her collection, 1/4 are foreign. Of the foreign coins, 2/5 are from Mexico.
\n" ); document.write( "What fraction of the collection are foreign coins that are not from Mexico?\r
\n" ); document.write( "\n" ); document.write( "1/4*2/5=2/20=1/10 from Mexico
\n" ); document.write( "9/10 not from Mexico. \n" ); document.write( "
Algebra.Com's Answer #677638 by math_helper(2461)\"\" \"About 
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\n" ); document.write( "I think you made a mistake in your calculation because the question asks for foreign coins not from Mexico, as a fraction of the _entire_ collection.
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\n" ); document.write( "\n" ); document.write( "Let C = number of coins in entire collection
\n" ); document.write( "Let F = number of foreign coins (F = (1/4)C)\r
\n" ); document.write( "\n" ); document.write( "number of foreign coins from Mexico = (2/5)F = (2/5)(1/4)C = (2/20)C = (1/10)C\r
\n" ); document.write( "\n" ); document.write( "The question asks for the fraction of the (entire) collection that are foreign coins not from Mexico.\r
\n" ); document.write( "\n" ); document.write( "That fraction is F - (1/10)C = (1/4)C - (1/10)C = (5/20)C - (2/20)C = (3/20)C\r
\n" ); document.write( "\n" ); document.write( "—\r
\n" ); document.write( "\n" ); document.write( "Check: (3/20)C + (2/20)C = (5/20)C = (1/4)C = F = number of foreign coins.\r
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