Answer :

A liquid is 7 litres water and 18 litres acid.

Let x litres acid is added to this liquid.

Now,

The liquid is 7 litres water and (18 + x) litres acid.

Now,

Initial percentage of acid =

⇒ Initial percentage of acid = 72% -- (1)

Final percentage of acid = – (2)

Let change in percentage of the acid be R

⇒

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