SOLUTION: What strength of 20 ml acid should be added to 10 ml of 50% acid to get an average strength of 20% acid?

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Question 484281: What strength of 20 ml acid should be added to 10 ml of 50% acid to get an average strength of 20% acid?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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What strength of 20 ml acid should be added to 10 ml of 50% acid to get an average strength of 20% acid?
:
let x = the strength (in decimal form) of the 20 ml of acid which is to be added
:
20x + .50(10) = .20(20+10)
20x + 5 = .20(30)
20x = 6 - 5
20x = 1
x = 1%2F20
x = .05 which is 5% strength