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 | 
