Square garden is 12 feet long on each side. Put a post at each corner and every 3 feet on each side. How many posts total?

As it is a square all sides are equal so all sides are 12 feet long.

how many posts on one side?

First we find out how many lengths of 3 we have for 1 side:

12 / 3 = 4

And then multiply this by the amount of sides

4 * 4 = 16

We need 16 posts

1 - 1 - 1 - 1 - 1

1 1

1 1

1 1

1 - 1 - 1 - 1 - 1