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!!??