SOLUTION: A quadrilateral had a perimeter of 60 cm. The length of its' sides are consecutive even integers. What are the lengths of each side?

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Question 894273: A quadrilateral had a perimeter of 60 cm. The length of its' sides are consecutive even integers. What are the lengths of each side?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
A quadrilateral had a perimeter of 60 cm. The length of its' [sic] sides are consecutive even integers. What are the lengths of each side?
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s = shortest side's length
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s + s+2 + s+4 + s+6 = 60
4s + 12 = 60
s = 12 cm
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I've never seen its' before.
it's for possessive is a frequently seen mistake, but its' is a new one.