document.write( "Question 1054956: Book A weighs 1.2 pounds and Book B weighs 1.3 pounds. If there are a total of 20 of these books in a box and the total weight of the books is 25.3 pounds, how many of each type of book are in the box? I set up A+B=20; B=20-A; and 1.2A+1.3B-25.3. But I can not figure out from there, please advise. \n" ); document.write( "

Algebra.Com's Answer #670169 by ikleyn(52797) $\"\"$ $\"About$

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\n" ); document.write( "Book A weighs 1.2 pounds and Book B weighs 1.3 pounds. If there are a total of 20 of these books in a box and
\n" ); document.write( "the total weight of the books is 25.3 pounds, how many of each type of book are in the box?
\n" ); document.write( "I set up A+B=20; B=20-A; and 1.2A+1.3B-25.3.
\n" ); document.write( "But I can not figure out from there, please advise.
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document.write( "   A +    B = 20,     (1)\r\n" );
document.write( "1.2A + 1.3B = 25.3.   (2)\r\n" );
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document.write( "From (1), B = 20-A. Substitute it into (2). You will get\r\n" );
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document.write( "1.2A + 1.3*(20-A) = 25.3,\r\n" );
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document.write( "1.2A + 26 - 1.3A = 25.3,\r\n" );
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document.write( "-0.1A = 25.3 - 26,\r\n" );
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document.write( "-0.1A = -0.7.\r\n" );
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document.write( "Can you continue and complete?\r\n" );
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