Anna wants to put a fence around a rectangular garden plot that measures 9 feet by
18 feet. she wants to place posts at the corners of the plot and every 2 feet around
the perimeter of the plot. how many posts does she need?

The answer is:

Anna will need 27 posts.

To calculate how many post does she need to place at the corners and every 2 feet around, we need to calculate the perimeter of the garden plot.

So, we can calculate the perimeter of the garden plot (rectangle) using the following formula:

We know that:

Then, calculating the perimeter of the garden plot, we have:

Now, calculating how many post she will need, we have:

Hence, we have that Anna will need 27 posts.

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