Final answer:
Without additional information, we can't provide a specific number for how many more milligrams Patient A receives than Patient B. The algebraic expression representing this difference is 2x - 72 milligrams, where x is the amount received by Patient A.
Step-by-step explanation:
The question is asking for the difference in milligrams of medicine between Patient A and Patient B when a total of 72 milligrams is dispensed. To solve this, we need to assume a value for the amount received by Patient A and then subtract this from the total to find the amount received by Patient B. However, without additional information, we can't provide a specific number. The difference in milligram dosage would be represented by the following algebraic expression if we assume Patient A receives x milligrams: x - (72 - x).
This simplifies to 2x - 72 milligrams, which is the algebraic representation of how many more milligrams Patient A receives than Patient B.