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**finite math help??**

Just need a clue of how to start this problem (kinda confused with the ratios)

I know what the answer is, (from back of book)just need to know how to set it up in order to do other problems??

**Each ounce of substance A supplies 5% of the nutrition a patient needs. Substance B supplies 12% of the required nutrition per ounce. If digestive restrictions require that the ratio of substance A to Substance B be 3/5, how many ounces of each should be in the diet to provide 100% of the required nutrition??**

thanks for any help!!??