SOLUTION: Marge can paint her house in 12 hours. If John helps her it takes them 9 hours. How long does it take John to paint the house by himself
Algebra.Com
Question 96141: Marge can paint her house in 12 hours. If John helps her it takes them 9 hours. How long does it take John to paint the house by himself
Answer by checkley71(8403) (Show Source): You can put this solution on YOUR website!
12j/(12+j)=9 now cross multiply
9(12+j)=12j
108+9j=12j
12j-9j=108
3j=108
j=36 hours for John to paint the house.
proof
12*36/(12+36)9
432/48=9
9=9
RELATED QUESTIONS
John can paint a room in 10 hours by himself. If kelly helps, they can paint the same... (answered by TimothyLamb)
If it takes Sally 4 hours to paint a house and John 6 hours to paint the same house, how... (answered by stanbon,RAY100)
If sally can paint a house in 4 hours and John can paint a house in 6 hours, how long... (answered by Alan3354)
Mary can paint a house in 4 hours. John can paint a house in 6 hours. How long will it... (answered by Edwin McCravy)
IF IT TAKES SALLY 4 HOURS TO PAINT A HOUSE AND IT TAKES JOHN 6 HOURS TO PAINT THE SAME... (answered by funmath)
if john can paint a room in 2 hours while peter takes 6 hours . how long will it take... (answered by ewatrrr,richwmiller)
If Sally can paint a house in 4 hours and John can paint the same house in 6 hours. How... (answered by richwmiller,Earlsdon)
if Jane takes 5 hours to paint a house and John takes 6 hours to paint a house. How long... (answered by rapaljer)
If John can paint a house in 6 hours. Mary can paint one in 4 hours and Sue can paint... (answered by ankor@dixie-net.com)