求一道数学题, 哪位大虾支招，不胜感激！

one gram of a certain health food contains 7 percent of the minimum daily requirements vitamin E and 3 percent of the minimum daily requirements of vitamin A. If vitamin E and A are to be obtained from no other source, approximately, how many grams of the health food must be eaten daily to provide at least the minimum daily requirements of both vitamin?

A 3, B 7 C10, D 14 E 33

答案是E吧

依据vitamin A计算

one gram＝3%vitamin A

X grams＝100%vitamin A

求出X