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
题目的意思是:一克食物含有每日所需VE总量的7%和VA总量的3%,问大约每天要吃多少克食物才能满足两种维生素摄取量。因为VA含量最少,所有必须满足VA的同时自然满足了VE的摄取量。于是结论:1克食物满足日摄取量的3%,10克满足30%,33克满足99%
欢迎光临 国际顶尖MBA申请交流平台--TOPWAY MBA (http://forum.topway.org/) | Powered by Discuz! 7.2 |