document.write( "Question 162043: maria wax her car in 2 hours when she works with susan they can wax the car in 45 mins. how long will it take susan working by herself to wax the car? \n" ); document.write( "
Algebra.Com's Answer #119419 by ankor@dixie-net.com(22740)\"\" \"About 
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Maria waxes her car in 2 hours. When she works with Susan, they can wax the car
\n" ); document.write( " in 45 mins. How long will it take Susan, working by herself, to wax the car?
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\n" ); document.write( "Let x = time required by Susan by herself
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\n" ); document.write( "Change 45 min to hrs: 45/60 = .75 hrs
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\n" ); document.write( "Let the completed job = 1
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\n" ); document.write( "Each will do a fraction of the job and will add up to 1
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\n" ); document.write( "\".75%2F2\" + \".75%2Fx\" = 1
\n" ); document.write( "Multiply equation by 2x to eliminate the denominators, solve for x
\n" ); document.write( ".75x + 2(.75) = 2x
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\n" ); document.write( ".75x + 1.5 = 2x
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\n" ); document.write( "1.5 = 2x - .75x
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\n" ); document.write( "1.5 = 1.25x
\n" ); document.write( "x = \"1.5%2F1.25\"
\n" ); document.write( "x = 1.2 hrs, for Susan to do the job by herself
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\n" ); document.write( "Check solution on a calc
\n" ); document.write( ".75/2 + .75/1.2 = 1\r
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