Mixtures and Allegation Strategy Strategy to Solve in Minutes SSC CGL

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I have two sugar solutions. The concentration of sugar in them is 30% and 15%. What quantity of these should be mixed to obtain 600 mL of 21% concentrate solution?

Peter diluted Hydrochloric acid (HCl) to 25% instead of 60% by volume. How much pure HCl acid should he add to this 160 mL of diluted acid to achieve his objective of making 60% concentrated solution?

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