This is the way your meds are made. The first number is the dose of narcotic. The second number is the dose of the other medicine, usually Tylenol.
For example, if you are taking Percocet 10/325, every single pill has 10 mg of oxycodone and 325 mg of Tylenol.
If you are taking Norco 5/325, every single pill has 5 mg of hydrocodone and 325 mg of Tylenol. If you are taking Vicoprofen 10/200, every single pill has 10 mg of hydrocodone and 200 mg of ibuprofen.
Always ask your doctor if you have specific questions on your medications.