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一道数学题
One gram of a certain health food contains 7 percent of the minimum daily requirement of vitamin E and 3 percent of the minimum daily requirement of vitamin A.If vitamins 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 requirement of both vitamins?
A.3
B.7
C.10
D.14
E.33
这题答案是E,我怎么看不懂啊!好像条件不够啊?每天vitamins需要是多少啊?这是常识吗? |
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