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17 Jul 2003, 08:13
Kudos
Bookmarks
A fence as in fence, the ones we all see has a 42.5 foot fence with 1/2 foot wide vertical boards are arranged 3 feet apart. How many vertical boards are needed for the entire fence?
The trick I think the connector between each fence but no length is given!
Pretty difficult, I would say.
The trick I think the connector between each fence but no length is given!
Pretty difficult, I would say.
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17 Jul 2003, 10:06
Kudos
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Let us draw a picture
* is a stick
_ is an in-between foot
Thus, the fence is:
*_ _ _ *_ _ _ * _ _ _ * _ _ _ and so on
If X is the number of sticks, then X-1 is the number of in-between three-feet sections.
Finally, X*1/2+(X-1)3=42.5, where X=13
* is a stick
_ is an in-between foot
Thus, the fence is:
*_ _ _ *_ _ _ * _ _ _ * _ _ _ and so on
If X is the number of sticks, then X-1 is the number of in-between three-feet sections.
Finally, X*1/2+(X-1)3=42.5, where X=13
17 Jul 2003, 10:33
Kudos
Bookmarks
stolyar
Let us draw a picture
* is a stick
_ is an in-between foot
Thus, the fence is:
*_ _ _ *_ _ _ * _ _ _ * _ _ _ and so on
If X is the number of sticks, then X-1 is the number of in-between three-feet sections.
Finally, X*1/2+(X-1)3=42.5, where X=13
* is a stick
_ is an in-between foot
Thus, the fence is:
*_ _ _ *_ _ _ * _ _ _ * _ _ _ and so on
If X is the number of sticks, then X-1 is the number of in-between three-feet sections.
Finally, X*1/2+(X-1)3=42.5, where X=13
Ans=13
I got the same answer but I actually drew the picture before I got it. Could you explain your formula. I didnt understand the x-1 bit. Please elobrate.
