Question

You want to mix a 5% blue dye with a 20% blue dye to make a 12% blue dye. The function y = ..... gives the concentration y of blue dye after you add x mL of the 20% dye to 100 mL of the 5% dye. How much of the 20% dye must you add to get a dye that is 12% concentrated?

Answer 1

y = what I have above

Answer 2

@mathstudent55

Answer 3

a. 62.5 mL
b. 75 mL
c. 87.5 mL
d. 112.5 mL

Answer 4

y is the concentration of blue dye.
You want y to equal 12%
So set the fraction equal to 12% = 0.12 and solve for x.