37. One gram of a certain food contains 7 percent of the minimum daily requirement of vitamin E and 3 percent of the minimum daily requirement 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 requirement of both vitamins?

A.3 B.7 C.10 D.14 E.33

有劳NN们了，谢谢！

题目问你最少吃多少这东西才能吸取足够的VC 和V D

已知：１克含７％OF所需的的VE和３％OF所需的VD

要能有１００％所需的VE 需要吃１００／７＝14克
要能有１００％所需的VD 需要吃１００／３＝33克

所以要能有１００％VE和VD 只能取比较大的喽

看懂题就很好理解

１克里含７％所需要的最小量E,假设，每天需要最小量E为X，那么

１＝７％X　X=100/7

同理，每天所需A为Y,　Y=100/３

为了满足两者都有，最小值取１００／３．（因为１００／３＞１００／７，已经涵盖了E)

应该很清楚了吧！