SOLUTION: We have 2.5 kg 5% solution. How much 20% solution should be mixed to it to get a 12 % concentrated solution ?

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Question 1009788: We have 2.5 kg 5% solution. How much 20% solution should be mixed to it to get a 12 % concentrated solution ?
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Call the amount of 20% solution you are adding, x. The set up is like this
.05(2.5) + .20x = .12(2.5 + x)
.125 + .2x = .3 + .12x
.08x = .175
x = .175/.08 = 2 3/16 kg or 2.1875 kg of 20% solution