## Dilution problem

by Noor

(Canada)

Hello,I'm having such a hard time setting up proportion math,

i just can't figure it out which number suppose to go on top and bottom,so please help me my friend?

Here is my question:

**Rx cephazolin 2% ophthalmic drops 10 ml.**

To make this order,use cephazolin injection 500 mg/10 ml vial.

How many milliliters from the vial of cephazolin will be in the final preparation?

thank you!