document.write( "Question 1119779: Housecleaning: Sally can clean the house in 6 hours, and her father can clean the house in 4 hours. Sally's younger brother, Dennis, can completely mess up the house in 8 hours. If Sally and her father clean and Dennis plays, how long will it take to clean the house? \n" ); document.write( "
Algebra.Com's Answer #735384 by josgarithmetic(39617)![]() ![]() ![]() You can put this solution on YOUR website! Just a hint: \n" ); document.write( "Sally and Father work at positive rates. Brother \"works\" at a negative rate. One job, 1 whole job, is \"cleaning the house\". \n" ); document.write( " |