You need a 60% alcohol solution. On hand, you have a 300 mL of a 55% alcohol mixture. You also have 85% alcohol mixture.

Question

You need a 60% alcohol solution. On hand, you have a 300 mL of a 55% alcohol mixture. You also have 85% alcohol mixture. How much of the 85% mixture will you need to add to obtain the desired solution?

Answer 1

.55(300) + .85x = .60(x+300)

165 + .85x = .60x + 180

.25x = 15

x = 15/.25= 60 invested at 85%

300 invested at 55%

to yield

360 of 60%