SOLUTION: John can build a fence in 5 days. John worked alone for 1 day and then worked with David for 3 days at which time they finished the fence. How long would it take for David to build

Question 579470: John can build a fence in 5 days. John worked alone for 1 day and then worked with David for 3 days at which time they finished the fence. How long would it take for David to build the fence alone? Is the answer 15 days? Thanks, Mike
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
On the day alone, John built 1/5 of the fence leaving 4/5 to finish
in three more days john will do 3/5 of the fence.
which will leave 1/5 for David to do in 3 days.
3/5+3/x=4/5
subtract 3/5
3/x=1/5
so yes x=15

RELATED QUESTIONS
Mike and John can do a job together in 12 days. After John has worked alone 26 days,... (answered by scott8148)

A can build a room in 50 days. A & B together can build a room in 25 days. They worked... (answered by macston)

i have solved that if Worker A finishes a job in 8 days and worker B finishes it in 12... (answered by josmiceli)

Please help me solve this problem... i need it rn When john and marsha worked... (answered by stanbon)

When A,B and C work together, they can finish installing the garden in 3 days. The job... (answered by ikleyn)

If A and B work on a project, they need 8 1/9 days. A worked alone for 8 days then B... (answered by josgarithmetic,ikleyn)

Amar can do a piece of work in 15 days. when he had worked for 3 days, sameer joined him... (answered by lwsshak3)

Brandon and Chris together can do a piece of work in 12 days. After Brandon has worked... (answered by ankor@dixie-net.com)

Jerry worked for one day on a project that he could have completed alone in nine days.... (answered by ankor@dixie-net.com)