SOLUTION: A mason and his assistant work on a fireplace for 6 hours together. Then the mason leaves. The assistant works 12 more hours to finish the fireplace.
The mason can complete a
Algebra ->
Rate-of-work-word-problems
-> SOLUTION: A mason and his assistant work on a fireplace for 6 hours together. Then the mason leaves. The assistant works 12 more hours to finish the fireplace.
The mason can complete a
Log On
Question 1030613: A mason and his assistant work on a fireplace for 6 hours together. Then the mason leaves. The assistant works 12 more hours to finish the fireplace.
The mason can complete a fireplace by himself in 15 hours.
How long would it take the assistant to build the fireplace by himself?
You can put this solution on YOUR website! What each does in 1 hour
Mason (1/15)
Assistant (1/x)
Together [(6/15)+(6/x)]+(12/x)=1 complete fireplace
multiply all by 15x to clear fractions
6x+90+180=15x
6x+270=15x
9x=270
x=30 hours
