请教一题 Need NN help

pic100

A square piece of sailcloth is trimmed by 4 feet on one edge to form a rectangular piece, which is then cut in half to create two rectangular sails, if the area of each of the sail is 240 square feet, what was the perimeter of the original piece of sailcloth.

A. 75

B. 88

C. 96

D. 104

E. 476

My answer is 480 feet.

lakegirl

以下是引用BOYKING在2004-12-2 10:11:00的发言：

我的算法：设原边长为X, 则 (x-4)*X=480

解方程得出X为：24

于是原来正方形周长为：24*4=96 feet。所以我选 C。

和你的答案不一样啊？楼主怎么算的？

C

pic100

以下是引用BOYKING在2004-12-2 10:11:00的发言：

我的算法：设原边长为X, 则 (x-4)*X=480

解方程得出X为：24

于是原来正方形周长为：24*4=96 feet。所以我选 C。

和你的答案不一样啊？楼主怎么算的？

Thank you for your answer.

Maybe I misunderstand the question.

I think after trimming 4 feet, the cuted sailcloth's one side is 4 feet and then is cuted in middle.

so 2*X=240 then x=120 priemter is 480

pic100

以下是引用BOYKING在2004-12-3 9:43:00的发言： > 呵呵，原来是读题的失误。楼主以后可得仔细了，：）

Thank you. I will.