Written question algebra please please help

Question

You need a 5% alcohol solution. On hand, you have a 55 mL of a 40% alchohol mixture. How much pure water will you need to add to obtain the desired solution?   You will need ______ mL of pure water to obtain_____ mL of the desired 5% solution

Answer 1

concentration x volume = concentration x volume

 

(55)(.40) =( x)(.05)

 

x = 440 mL

 

So, you add 440 - 55 mL of water = 385 mL of water