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
Ans:E
對題目的理解有一點疑惑...我是這樣想的...
1gram的食物中至少7%為維他命E,至少3%為維他命A...
問要吃多少gram的食物才能有最小的兩種維他命?
所以我選A....因為minimum 的兩種維他命...所以A和E要最小 最吃最少的gran....3x0.07+3x0.03=0.3.......
還是我理解題目錯誤呢??請高手指點~~~謝謝!!!