Question 1130115
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The problem says that there are 3 equal parts (volumes) of water and 2 equal parts (volumes) of acid.


It means 5 parts of the mixture liquid, in all.


5 parts comprise 12.5 liters - hence, each part is  {{{12.5/5}}} = 2.5 liters.


Thus you get the answer:  3*2.5 liters = 7.5 liters of water and 2*2.5 liters = 5 liters of the acid.
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Solved.


Ignore each and every other different answer - since it is INCORRECT.