document.write( "Question 509134: If Sally can paint a house in 4 hours, & John can paint the same house in 6 hours, how long will it take for both of them to paint the house together? \n" ); document.write( "
Algebra.Com's Answer #341262 by nerdybill(7384) You can put this solution on YOUR website! If Sally can paint a house in 4 hours, & John can paint the same house in 6 hours, how long will it take for both of them to paint the house together? \n" ); document.write( ". \n" ); document.write( "Let x = time (hours) it takes for both \n" ); document.write( "then \n" ); document.write( "x(1/4 + 1/6) = 1 \n" ); document.write( "multiplying both sides by 12: \n" ); document.write( "x(3 + 2) = 12 \n" ); document.write( "x(5) = 12 \n" ); document.write( "x = 12/5 hours \n" ); document.write( "x = 2.4 hours \n" ); document.write( "or \n" ); document.write( "x = 2 hours and 24 minutes \n" ); document.write( " |