help please

Each ounce of substance A supplies 7% of the required nutrition a patient needs. Substance B supplies 20% of the required nutrition per ounce, and substance C supplies 13% of the required nutrition per ounce. If digestive restrictions require that substances A and C be given in equal amounts and that the amount of substance B be one- fourth of these other amounts, find the number of ounces of each substance that should be in the meal to provide 100% nutrition. substance A oz substance B oz substance C OZ