Question

A square pen is made using four posts on each side. How many posts were used?​

Answer 1

Answer: 12 posts

Explanation: there are 4 posts on each side, but some posts will overlap because there must be posts on the 4 corners.
So first do
4x4=16
Then you have to subtract the overlapping posts on the 4 corners, so
16-4=12

Answer 2

Explanation:

If a square pen is made using four posts on each side, then the total number of posts used can be found by multiplying the number of sides by the number of posts per side. Since there are four sides to a square, we can multiply 4 by 4 to get:

4 x 4 = 16

Therefore, 16 posts were used to make the square pen.