请问,a tailor trims 4 feet from opposite edges of a square piece of cloth,and 5 feet from the other two edges. if 120 square feet of cloth remain,what was the length of a side of the original piece of cloth?
答案:20
谁能告诉我究竟是怎么剪的?作者: lisaislisa 时间: 2003-1-23 21:14
the fomula is (x-2*4)(x-2*5)=120
x=20
but firstly I thought i would be (x-4)(x-5)=120
your idea ?