Homework Help: Math

Posted by Nancy on Thursday, March 1, 2012 at 12:11pm.

a chemist has an 18% acid solution and a 36% acid solution. How many liters of each of these solutions should be mixed together to make 24L of 30% solution?
Enter two numbers separated by a comma

Math - Steve, Thursday, March 1, 2012 at 3:25pm
x liters of 18% acid has .18x liters of acid
y liters of 36% acid has .36y liters of acid

24 liters of 30% acid has .24*30 liters of acid

x+y = 24

.18x + .36(24-x) = .30*24
.18x + 8.64 - .36x = 7.2
.18x = 1.44
x = 8

so, 8L of 18% + 16L of 36% = 24L of 30%
Math - jasmine, Friday, March 15, 2013 at 6:03pm
8,16

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