Question

A farmer has 100 m of fencing to make a rectangular pen with 3 congruent rectangular subdivision side by side. Each subdivisions must be 3 meter wide and at least 8 meters long. What is the range of the possible length of it's division?
so, if the divisions are x meters long, we have

4*3 + 6x <= 100
6x <= 88
x <= 44/3
so,

8 <= x <= 44/3

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