I really need help

Question

You need a 85% alcohol solution. On hand, you have a 50 mL of a 60% alcohol mixture. You also have 90% alcohol mixture. How much of the 90% mixture will you need to add to obtain the desired solution?

_____ mL of the 90% solution to obtain

 _____mL of the desired 85% solution.

Answer 1

Here is a Desmos graph showing the point of intersection of the two linear equations from the video.

desmos.com/calculator/xlpe1bf4ac