document.write( "Question 1099742: Fran Thompson can wash windows in the lobby at the Days Inn in 3 hours. Jill Franks can wash the same windows in 4.5 hours. How long will it take them working together to wash the windows?
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Algebra.Com's Answer #714216 by josmiceli(19441) $\"\"$ $\"About$

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Add their rates of washing to get their rate washing together
\n" ); document.write( "Fran's rate:
\n" ); document.write( "[ 1 job ] / [ 3 hrs ]
\n" ); document.write( "Jill's rate:
\n" ); document.write( "[ 1 job ] / [ 4.5 hrs ]
\n" ); document.write( "Working together:
\n" ); document.write( "[ 1 job ] / [ t hrs ]
\n" ); document.write( "-----------------------
\n" ); document.write( " $\"+1%2F3+%2B+1%2F4.5+=+1%2Ft+\"$
\n" ); document.write( " $\"+1%2F3+%2B+2%2F9+=+1%2Ft+\"$
\n" ); document.write( "Multiply both sides by $\"+9t+\"$
\n" ); document.write( " $\"+3t+%2B+2t+=+9+\"$
\n" ); document.write( " $\"+5t+=+9+\"$
\n" ); document.write( " $\"+t+=+1.8+\"$
\n" ); document.write( " $\"+.8%2A60+=+48+\"$
\n" ); document.write( "Working together, they can wash the windows
\n" ); document.write( "in 1 hr 48 min
\n" ); document.write( "-----------------------
\n" ); document.write( "check answer:
\n" ); document.write( " $\"+1%2F3+%2B+2%2F9+=+1%2F1.8+\"$
\n" ); document.write( " $\"+1%2F3+%2B+2%2F9+=+10%2F18+\"$
\n" ); document.write( " $\"+1%2F3+%2B+2%2F9+=+5%2F9+\"$
\n" ); document.write( "Multiply both sides by $\"+9+\"$
\n" ); document.write( " $\"+3+%2B+2+=+5+\"$
\n" ); document.write( " $\"+5+=+5+\"$
\n" ); document.write( "OK \n" ); document.write( "

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