Posted by **Monica** on Friday, July 5, 2013 at 6:05pm.

An 80% acid solution is to be mixed with a 30% solution to get 90 gallons of a 50% solution. How many gallons of each solution are needed?

- math -
**Kuai**, Friday, July 5, 2013 at 6:50pm
0.8x + 0.3(90-x) = .5(90)

.8x + 27 -.3x = 45

.5x +27 = 45

.5x + 27 - 27 = 45-27

.5x = 18

x = 36

36 at 80%

54 at 30%

- math -
**Monica**, Friday, July 5, 2013 at 7:31pm
Kuai, you are awesome!!! Thank you very much! I really appreciate it!

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