document.write( "Question 697626: Please help me solve this equation: A risograph machine can finish 100 pages in 1 minute. How many books of 250 pages can the machine copy in 20 minutes ? \n" ); document.write( "
Algebra.Com's Answer #430178 by josmiceli(19441)\"\" \"About 
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Let \"+x+\" = number of books of \"+250+\" pages
\n" ); document.write( "that the machine can copy in \"+20+\" min
\n" ); document.write( "Note that \"+250x+\" would be the number of pages
\n" ); document.write( "that the machine can copy in \"+20+\" min
\n" ); document.write( "--------------
\n" ); document.write( "The machine's rate of copying is \"+100%2F1+\" pages / min
\n" ); document.write( "I can say that
\n" ); document.write( "\"+100+%2F+1+=+250x+%2F+20+\"
\n" ); document.write( "This is just ( pages/min = pages/min )
\n" ); document.write( "\"+2000+=+250x+\"
\n" ); document.write( "\"+x+=+8+\"
\n" ); document.write( "The machine can copy 8 books of 250 pages in 20 min
\n" ); document.write( "check:
\n" ); document.write( "\"+8%2A250+=+2000+\"
\n" ); document.write( "\"+2000+%2F+20+=+100%2F1+\"
\n" ); document.write( "OK\r
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