document.write( "Question 1054311: 12 Workers can finish a third of a house in 15 days. How many workers must be added to finish the rest of the house in the next 18 days? \r
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Algebra.Com's Answer #669527 by Boreal(15235)\"\" \"About 
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12 workers do 1/3 of a house in 15 days
\n" ); document.write( "in 1 day 12 workers do 1/45 of a house
\n" ); document.write( "1 worker does 1/540 of a house in a day, since 12 workers do 1/45th of a house (12/540)
\n" ); document.write( "want to know how many workers do 2/3 of a house in 18 days. Let the number = x.
\n" ); document.write( "18x/540=2/3 of a house. 18x is 18 days*x number of workers.
\n" ); document.write( "cross multiply
\n" ); document.write( "1080=54x
\n" ); document.write( "x=20
\n" ); document.write( "8 more workers must be added, since there are 12 to begin with.
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\n" ); document.write( "Check
\n" ); document.write( "12 workers can do 1/3 of a house in 15 days or the whole house in 45 days.
\n" ); document.write( "That means that there are 540 worker-days required to build the house.
\n" ); document.write( "12*15=180 worker days, the 1/3 of a house.
\n" ); document.write( "The 20 workers*18 days is 360 worker days, and that is 2/3 of the house.\r
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