response D = 22
2*length + 2* width = 240
There are 6 fence posts for the length so 5 15-foot intervals between them, 75 feet
75*2 + 2* width = 240 then width = 45
If we double width = 90 then there are 6 15-foot intervals, as the result 7 fence posts for the width
7 + 7 + 6 + 6 - 4 = 22 ( we subtract 4 in order to avoid duplicates as 4 fences are vertices of the rectangular pasture)
Hope that helps
2*length + 2* width = 240
There are 6 fence posts for the length so 5 15-foot intervals between them, 75 feet
75*2 + 2* width = 240 then width = 45
If we double width = 90 then there are 6 15-foot intervals, as the result 7 fence posts for the width
7 + 7 + 6 + 6 - 4 = 22 ( we subtract 4 in order to avoid duplicates as 4 fences are vertices of the rectangular pasture)
Hope that helps
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