Ronin puts a fence around a field using 30 meters of wire. The length of the fence is four times its width. What is the width of the fence?

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The fence has to go round two lengths and two widths, so one length and one width is half the length of the fence=30/2=15m. The length counts for 4 widths, so 5 widths=15m, and width = 15/5=3m, so the length is 4 times this=12m.

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