John can build a fence in 2 days; Bill can build the same fence in 5 days. If John and Bill worked together, how long would it take them to build the fence?
thanks!
2006-09-26 13:19:09 · 6 answers · asked by ♥ 3 in Science & Mathematics ➔ Mathematics
John can build half of a fence in a day. Bill can build 1/5th of a fence in a day. Working together, they will work X days.
X/2+X/5=1 whole fence.
5X+2X=10 (multiply both sides by 10)
7X=10. X=10/7 days for them to build the fence when they work together.
2006-09-26 14:17:38 · answer #1 · answered by zex20913 5 · 0⤊ 0⤋
3 days
2006-09-26 21:16:17 · answer #2 · answered by Anonymous · 0⤊ 1⤋
why would it take the two 3 days if we already know john has it done in two days...hmmmmm?? we know Bill can't do it in two days by himself so maybe he can just help John during the two days of work... My guess is 2 days
2006-09-26 20:30:27 · answer #3 · answered by Lavender 7 · 0⤊ 1⤋
2 and a half days
2006-09-26 20:29:03 · answer #4 · answered by iM BL0WiNG UP 2 · 0⤊ 1⤋
it would be : 2x < 5
-2x -2
--------
x < 3
so about three days i think ?
2006-09-26 20:21:56 · answer #5 · answered by Anonymous · 0⤊ 2⤋
three and one half days.
2006-09-26 20:32:45 · answer #6 · answered by kyle.keyes 6 · 0⤊ 1⤋