Acid

The barrel is 199 litres of 38% acid. How many percent acid occurs when 61 litres revoke and replace it with the same amount of water?

Correct result:

acid concentration =  26.4 %

Solution:

c=199−61199⋅38=26.4%c = \dfrac{ 199-61}{ 199} \cdot 38 = 26.4 \%

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