The ordered dose is 3 mg. Solution available is 25 mg / 5 ml calculate the dosage volume​

0.6 mL

Explanation:

This is a desire over have question, so first you will want to see your units are the same (mg to mg, g to g, etc).

Then after that , you will multiply with with the mL (which is 5) and divide by 25 mg, which is 0.6

3mg  * 5mL / 25 mg = 0.6 mL since the mg units cancel out.

probably since the potency of the cocaine, not a lot, but i've never done any research on cocaine so i wouldn't know, but i would also guess it would determine on the gap between sniffs or if you did it all at once, so i really don't know.