document.write( "Question 761591: 15 workers can build a wall in12 days.How many workers are need if the wall is to be built in 9 days? \n" ); document.write( "

Algebra.Com's Answer #463315 by josgarithmetic(39620) $\"\"$ $\"About$

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One way to find how many is, what is the rate of work from 1 worker?\r
\n" ); document.write( "\n" ); document.write( "1 job is, \"build the wall\". From the given about 15 workers, 1 worker builds the wall in 12*15 days, so $\"1%2F%2812%2A15%29\"$ jobs per day. \r
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\n" ); document.write( "\n" ); document.write( "The rates of workers building together are simply added. How many workers, n, build the wall in 9 days? $\"highlight%28+n%281%2F%2812%2A15%29%29%2A9=1%29\"$ . That is Rate*Time=Jobs.\r
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\n" ); document.write( "\n" ); document.write( " $\"n=1%2A%2812%2A15%29%2F9\"$
\n" ); document.write( " $\"n=%283%2A4%2A3%2A5%29%2F%283%2A3%29\"$
\n" ); document.write( " $\"highlight%28n=20%29\"$ workers. \n" ); document.write( "

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