CAT 2016 Quantitative Ability

Question : 8 of 34

Marks: +1, -0

A 100 ml flask contains 30% acid solution. What quantity of the solution should be replaced with 12% acid solution so that the resultant solution contains 21% acid?

50 ml
44.44 ml
33.33 ml
64 ml

Validate

Solution:

Let x ml of the solution be replaced with 12% acidsolution. Therefore

\;\;{30}/{100}×(100-x)+\;\;{12}/{100}×x

=\;\;{21}/{100}×100

⇒x=50

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