document.write( "Question 1107663: Hi
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document.write( "there were 610 watches and pens in a box. 1/5 of the watches and 1/3 of the pens were from Japan.
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document.write( "The rest korea. If a total of 150 watches and pens were from Japan, \r
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document.write( "how many watches in the box\r
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document.write( "how many pens from Korea. \r
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document.write( "Thanks \n" );
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Algebra.Com's Answer #722685 by Theo(13342)![]() ![]() You can put this solution on YOUR website! let w = number of watches. \n" ); document.write( "let p = number of pens.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "w + p = 610\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "1/5 of the watches and 1/3 of the pens were from japan. \n" ); document.write( "a total of 150 watches and pens were from japan.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "1/5 * w + 1/3 * p = 150\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "these 2 equations need to be solved simultaneously.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "leave the first equation as is and multiply both sides of the second equation by 5 to get:\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "w + p = 610 \n" ); document.write( "w + 5/3 * p = 750\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "subtract the first equation from the second to get:\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "2/3 * p = 140.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "solve for p to get 210.\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "if w + p = 610, and p = 210, then w must be equal to 400.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "you get w + p = 400 + 210 = 610.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "you get 1/5 * w + 1/3 * p = 1/5 * 400 + 1/3 * 210 = 80 + 70 = 150.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "this confirms that the solutions are correct because the original equations are both true when w = 400 and p = 210.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "you were asked:\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "how many watches in the box? \n" ); document.write( "how many pens from Korea? \r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "since w = the number of watches, then the number of watches in the box = 400.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "since p = the number of pens in the box, and since 1/3 of the pens in the box were from japan, then 2/3 of the pens in the box were from korea.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "2/3 * p = 2/3 * 210 = 140.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "your solution is:\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "the number of watches in the box was 400.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "the number of pens in the box from korea was 140.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "if you drew a table of what was in the box, it would look something like this:\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \r\n" ); document.write( "\r\n" ); document.write( " watches pens total\r\n" ); document.write( "\r\n" ); document.write( "japan 80 70 150\r\n" ); document.write( "\r\n" ); document.write( "korea 320 140 460\r\n" ); document.write( "\r\n" ); document.write( "total 400 210 610\r\n" ); document.write( "\r\n" ); document.write( "\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |