document.write( "Question 805787: A plumber charges Php150 per hour for his labor and Php120 per hour for his assistant. On a repair job the bill was Php3440 with Php2460 for labor and Php980 for parts. If the assistant worked for two hours less than the plumber, how many hours did each work? \n" ); document.write( "
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A plumber charges Php150 per hour for his labor and Php120 per hour for his assistant. On a repair job the bill was Php3440 with Php2460 for labor and Php980 for parts. If the assistant worked for two hours less than the plumber, how many hours did each work?\r
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\n" ); document.write( "\n" ); document.write( "Total bill = 3440
\n" ); document.write( "parts = 980
\n" ); document.write( "labor bill = 2460\r
\n" ); document.write( "\n" ); document.write( "Carpenter --------------150----------------x hours
\n" ); document.write( "assistant -------------120---------------(x-2) hours\r
\n" ); document.write( "\n" ); document.write( "labor bill = cost of plumber + cost of assistant\r
\n" ); document.write( "\n" ); document.write( "150x+120(x-2)=2460\r
\n" ); document.write( "\n" ); document.write( "150x+120x-240=2460\r
\n" ); document.write( "\n" ); document.write( "270x=2700
\n" ); document.write( "/270
\n" ); document.write( "x= 10 hours ----------carpenter\r
\n" ); document.write( "\n" ); document.write( "assistant ---------8 hours\r
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