I need 850mL of a 15% alcohol solution. On hand i have 85% alcohol mikxture. How much of the 85% alcohol mixture and pure water will i need?

Question

x+.85=.85x

850+.15=127.5

What is the percentage for pure water?

Answer 1

(xml)(85%) = (850 ml)(15%)

x = 150 ml of 85% plus 700 ml water