[求助]gwd 8-37

sandyzeng

请问一题:

37: one gram of a certain food contains 7 precent of the minimum daily requirement of vitamin E and 3 precent of minimum of vitamin A, if vitamin E and A are to be obtained from no other source, approximately how many gram of food must be eaten daily to provide at least the minimum daily requirement of both vitamin?

A:3, B:7, C:10, D:14, E:33

答案是E, 请问这33是如何得到的?没有最低克数要求的维他命, 光凭百分比如何得到食物的重量?

谢谢

mikejia

VE;7%,

VA:3%

如果要满足一天的E消耗量需要100/7克，满足一天A消耗量需要 100/3克；因为两种是独立的事件，both满足，则需要满足最多的A日消耗=100/3克。

以上是我个人理解，请指正。

[此贴子已经被作者于2004-12-22 21:41:55编辑过]