John builds a square with a side of 12 cm from some wire. If from the same wire, he builds a rectangle with a width of 6 cm, what will be the length of the rectangle? Pick one:
A) 18 cm	B) 19 cm	C) 20 cm	D) 21 cm	E) none

Rationale: solution : if the side of the square is 12 cm , then its perimetre will be 48 cm . we build the rectangle from the same wire , so it will have the same perimetre . its width is 6 cm , so its length will be ( 48 - 12 ) ÷ 2 = 36 ÷ 2 = 18 cm answer a
Answer: A