document.write( "Question 302109: If Sally can paint a hous3e in 4 hours, and john can paint the same house in 6 hours, how long will it take for both of then to paint the same house \n" ); document.write( "
Algebra.Com's Answer #216621 by stanbon(75887)![]() ![]() ![]() You can put this solution on YOUR website! If Sally can paint a hous3e in 4 hours, and john can paint the same house in 6 hours, how long will it take for both of then to paint the same house \n" ); document.write( "---- \n" ); document.write( "Sally's rate: 1/4 house/hr \n" ); document.write( "--- \n" ); document.write( "John's rate: 1/6 house/hr \n" ); document.write( "---- \n" ); document.write( "Together rate: 1/x house/hr \n" ); document.write( "================================ \n" ); document.write( "Equation: \n" ); document.write( "rate + rate = together rate \n" ); document.write( "1/4 + 1/6 = 1/x \n" ); document.write( "Multiply thru by 12x to get: \n" ); document.write( "3x + 2x = 12 \n" ); document.write( "5x = 12 \n" ); document.write( "x = 2.4 hrs (time for both to paint the house when working together) \n" ); document.write( "================ \n" ); document.write( "Cheers, \n" ); document.write( "Stan H. \n" ); document.write( " |