document.write( "Question 1062099: please help me solve this problem,\r
\n" ); document.write( "\n" ); document.write( "it takes 16 minutes for 9 people to paint 8 walls. how many minutes does it take for 4 people to paint 6 walls? \n" ); document.write( "
Algebra.Com's Answer #676887 by math_helper(2461)\"\" \"About 
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\n" ); document.write( "We first need to find the work-per-person (sometimes this type of thing is called \"normalization\"), once we know that, its easy to mix and match number of people and number of walls.
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\n" ); document.write( "The 9 people paint 8/16 = 1/2 wall every minute
\n" ); document.write( "Each person does 1/9 of that: Work_per_person = (1/2)*(1/9) = 1/18 wall/minute
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\n" ); document.write( "\n" ); document.write( "4 people paint 6 walls: (6 walls/4 persons) / (1/18 ) wall/minute/person
\n" ); document.write( " = 6*18/4 minutes
\n" ); document.write( " = 27 minutes.\r
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\n" ); document.write( "Another, more direct, way to do this:
\n" ); document.write( " 16 minutes * 9 people/4 people * 6 walls/8 walls = 27 minutes\r
\n" ); document.write( "\n" ); document.write( "I just set each fraction according to the qualitative nature of the 2nd configuration, with respect to \"will it take longer or shorter?\" That decides how to set the numerator and denominator.
\n" ); document.write( "I specified the units because they help prevent forgetting something.
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