如何列这个比例关系？？

linlin315

A ten-years comparison between the United States and the Sobiet Union in terms of crop yiels per acre revealed that when only planted acreage is compared, Sobiet yiels are equal to 68 percent of United states yields. When total agricultural acreage(planted acreage plus fallow acreage) is compared, however, Soviet yields is 114 percent of United States yield.
From the information above, which ov the following can be most reliably inferred about United States and Soviet agriculture during the ten-year period?

A. A higher percentage of tatal agricultural acreage was fallow in the United States than in the Soviet Union
B. The United States had more fallow acreage than planted acreage.
C. Fewer total acres of available agricultural land were fallow in the Soviet Union than in the United States
D. The Soviet Union had more planted acreage than fallow acreage.
E. The Soviet Union produce a greater volume of crops than the United States produced.

答案是：A
我想问问这个数学关系式该如何列？？3x^-^

cranberry

total products/total planted acre

total product/total acre

然后相除，得到全部耕种地占全部土地的比例，苏联是美国的1.5倍，则美国的休耕地的比例一定高于苏联

linlin315

对啊！！我怎么没想到相除呢？？谢谢！！

[此贴子已经被作者于2003-7-22 10:12:07编辑过]