SOLUTION: A vat contains 100 l of a 40% solution. How much acid must be added to increase the acidity to 60%?

Question 123565: A vat contains 100 l of a 40% solution. How much acid must be added to increase the acidity to 60%?
Found 2 solutions by chitra, josmiceli:
Answer by chitra(359) (Show Source): You can put this solution on YOUR website!
[40%][100 Liters ] + {100% }(x) = ( 60%)(100 + x )

again, x = amount of pure acid...

40 + x = 60 + .60x

0.40x = 20 .....

x = 50L
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = acid needed to be added
The equation in words is:
(original acid + added acid) / (total acid + water) = 60%
Originally,
l of acid
l of water

l of acid to be added
check:

OK
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