Cayley 2023 Part B - Question 12, CEMC UWaterloo

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This problem is tagged with cayley, cayley23, highschool.

(Cayley 2023, Part B, Question 12, CEMC - UWaterloo)

A $6$ m by $8$ m rectangular field has a fence around it. There is a post at each of the four corners of the field. Starting at each corner, there is a post every $2$ m along each side of the fence. How many posts are there?
$(A)$ $12$
$(B)$ $14$
$(C)$ $16$
$(D)$ $18$
$(E)$ $20$

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