You need a 10% alcohol solution. On hand, you have a 195 mL of a 5% alcohol mixture. You also have 75% alcohol mixture. How much of the 75% mixture will you need to add to obtain the desired solution?

Question

You will need ______ mL of the 75% solution

Thanks in advance

Answer 1

Let x be the volume of 75% solution.

The final solution will have volume 195+x.

195*.05 +.75x = .1(x+195)

The remaining algebra is elementary; I will leave it to you.