document.write( "Question 930639: Eric and Ryan have been hired to paint the houses in a new development. Working together the men can paint the house in two-thirds the time that it takes eric working alone. Ryan takes six hours to paint a house alone. How long does it take eric to paint a house working alone? \n" ); document.write( "
Algebra.Com's Answer #565183 by Alan3354(69443)![]() ![]() You can put this solution on YOUR website! Eric and Ryan have been hired to pain the houses in a new development. Working together the men can paint the house in two-thirds the time that it takes eric working alone. Ryan takes six hours to paint a house alone. How long does it take eric to paint a house working alone? \n" ); document.write( "============== \n" ); document.write( "It takes Eric E hours, take Ryan R hours (each working alone) \n" ); document.write( "Eric does 1/E per hour, Ryan does 1/R per hour. \n" ); document.write( "R = 6 hours \n" ); document.write( "--- \n" ); document.write( " They do (1/E + 1/6) = (E + 6)/6E job/hour together \n" ); document.write( "--> 6E/(E + 6) hours/job together \n" ); document.write( "6E/(E + 6) = (2/3)E \n" ); document.write( "6/(E + 6) = (2/3) \n" ); document.write( "2(E + 6) = 18 \n" ); document.write( "E = 3 hours \n" ); document.write( " |