A rectangular field is $80 \mathrm{~m}$ long and $60 \mathrm{~m}$ wide. If fence posts are placed at the corners and are $10 \mathrm{~m}$ apart along the 4 sides of the field, how many posts are needed to completely fence the field?
(A) 24
(B) 26
(C) 28
(D) 30
(E) 32
A rectangular field is $80 \mathrm{~m}$ long and $60 \mathrm{~m}$ wide. If fence posts are placed at the corners and are $10 \mathrm{~m}$ apart along the four sides of the field, how many posts are needed to completely fence the field?
(A) 24
(B) 26
(C) 28
(D) 30
(E) 32

## Solution

There is 1 post on each corner making a total of 4 plus 7 along each of the two lengths and 5 along each of the two widths.

This gives a total of 28 posts.

ANSWER: (C)