Question

A solution of 3% acid solution is to be concentrated by adding 9% acid solution to it. The resulting mixture is to be at least 5% but less than 7% . If there are 400 litres of 3% acid solution, how many litres of 9% solution will have to be added ? Represent the solution on number line.

Answer 1

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Answer 2

ANSWER:

Let x Lot 3% solution be added to 460 L of 9% solution of acid.

Then, total quantity of mixture = (460 + x) L.

Hence, the number of litres of the 3% solution of acid must be more than 230 and less than 920.

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