1998 CEMC Gauss (Grade 7) Problems/Problem 7
Problem
A rectangular field is 80 m long and 60 m wide. If fence posts are placed at the corners and are 10 m apart along the 4 sides of the field, how many posts are needed to completely fence the field?
Solution
There is one post on each of the corners, along with 7 other posts along each of the two lengths and 5 other posts along each of the two widths. In total, this gives us posts.