# math

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in her chemistry class, Lauren must produce 300ml of an 80% acid solution. Her teacher gives her two concentrations of acid solution, a 50% and a 100%. determine how much of each concentration that she must use.

• math -

.5x + 1y = .8(300)
x + y = 300
x = 300 - y

.5(300-y) + 1y = 240
150 - .5y + 1y = 240
1/2y = 90
y = 180 ml
300-180 = x = 120ml

use 120ml 50%
use 180ml 100%

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