SOLUTION: What is A 50ml 40% acid solution is added to a 150ml 30% acid solution. What will be the concentration of the resulting mixture?

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Question 1188831: What is A 50ml 40% acid solution is added to a 150ml 30% acid solution. What will be the concentration of the resulting mixture?

Found 2 solutions by ikleyn, greenestamps:
Answer by ikleyn(52803) About Me  (Show Source):
You can put this solution on YOUR website!
.

The concentration of the resulting mixture will be


    %2840%2A50+%2B+30%2A150%29%2F%2850+%2B+150%29  percents.


Use your calculator.



Answer by greenestamps(13200) About Me  (Show Source):
You can put this solution on YOUR website!


(adding to the response from tutor @Ikleyn....)

...or, if your mental arithmetic is good, solve the problem even faster using logical reasoning:

The amounts are 50ml and 150ml, for a total of 200ml.
So 150/200 = 3/4 of the mixture is the 30% acid.
So the percentage of the mixture is 3/4 of the way from 40% to 30%.

Use mental arithmetic to reach the answer of 32.5%