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Binomial Theorem

Question
CBSEENMA11014391

A manufacturer has 600 litres of a 12% solution of acid. How many litres of a 30% acid solution must be added to it so that acid content in the resulting mixture will be more than 15% but less than 18%?

Solution

Solution not provided.
Ans. More than 120 litres but less than 300 litres.

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