Need help with math for medication I need

Need help with math for medication I need   (01/12/2018, 7:12 PM)

I need to figure out this math problem:

I have 15 ML TOTAL LIQUID in a bottle (consisting of 76 MG of medication and the rest is Water totaling the 15 ML). I need to take 5 mg of the 76 MG of the medication in this bottle. So, how many ML of this medication/water mixture would I need to suck out of the bottle to give me the 5 MG of medication that I need?
I cannot figure this out after hrs. of trying. Thank you so much. Please respond. It is very important to my health.