Question

A lot is 21 ft by 30 ft. To support a fence, an architect wants an upright post at each corner and an upright post every 3 ft in between. How many of these posts are needed?

Answer 1

so 21 X3
&& 30X3?

Answer 2

should i do them both twice?

Answer 3

same on 21?

Answer 4

on that side is a little tricky because we already posts on all corners after we counted how many posts we put in the longer side

Answer 5

so its 180?