document.write( "Question 165668: A laser printer can print a page in 15 s. If a 16-page document is split between this printer and an older model, the two printers take 50 s to print the document, working together. How many seconds does it take the older model to print a page? \n" ); document.write( "
Algebra.Com's Answer #132106 by MathTherapy(10552)\"\" \"About 
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Since the laser printer can print 1 page in 15s, it follows that it can print 16 pages in 240s. With this 16-page job taking both printers 50s, it means, obviously that the older printer is faster than the laser printer.\r
\n" ); document.write( "\n" ); document.write( "Since the laser can print 16 pages in 240s, then it can print \"%281%29%2F%28240%29\" of the job in 1 sec.\r
\n" ); document.write( "\n" ); document.write( "To find what fraction of the 16-page job the old printer can do in 1 sec., when doing the job with the laser, we have:
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\n" ); document.write( "\n" ); document.write( "5 + 1200a = 24
\n" ); document.write( "1200a = 19
\n" ); document.write( "a = \"%2819%29%2F%281200%29\"\r
\n" ); document.write( "\n" ); document.write( "Since in 1 sec., the older printer does \"%2819%29%2F%281200%29\" of the job, then it can do the entire job in:
\n" ); document.write( "\"%28%2819%29%2F%281200%29%29%2F%281%29=%281%29%2F%28a%29=%2819a%29%2F%281200%29=1\"\r
\n" ); document.write( "\n" ); document.write( "19a = 1,200\r
\n" ); document.write( "\n" ); document.write( "a = \"%281200%29%2F%2819%29\" = 63.15789\r
\n" ); document.write( "\n" ); document.write( "This means that by itself, the older printer can do the entire 16-page job in 63.15789 seconds, which means that it can do 1 page in \"%2863.15789%29%2F%2816%29\" = 3.947368 ≈ 3.947 seconds. \r
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