Bunuel wrote:
laserglare wrote:
Can someone please explain why the answer is not D
I did it algebraically.
Basically since the 'space between pickets' is 6 inches and the pickets are 1/2 inch
why can't we just use 6 1/2 x + 1/2
Because each picket will have 6 inches of space and then you just add 1/2 inch for the extra picket. Doing this algebraically I get D
(6.5 x + .5) / 12 --> (13x + 1) / 24
A straight picket fence is composed of x pickets each of which is 1/2 inch wide. If there are 6 inches of space between each pair of pickets, which of the following represents the length of fence in feet?A. 13x/2
B. 13x/2 - 6
C. 13x/24
D. (13x+1)/24
E. (13x-12)/24
x pickets mean x-1 fences, each of which is 6 inches wide.
So, the length = \(6(x-1)+\frac{1}{2}*x=\frac{13x-12}{2}\)
inches, or \(\frac{13x-12}{24}\)
feet.
Answer: E.
Hope it's clear.
Hi,
Bunuel,
I was writing the equation down in the same way as
laserglare did.
I still cannot understand why we need to take number of pickets as X, and not number of gaps between them?
Please could you help me to understand it?
Thanks!