GMAT Percentage Practice Question

A 650 level GMAT problem solving practice question in percentage and mixtures. The question is a word problem in mixtures and percents.

Concept: Diluting the concentration of an additive in a mixture of two quantities by adding more of one of them.

You could expect 2 to 3 questions from percentage and fractions, quite often as word problems, in the quant section of the GMAT.

Question
A sample of 30 liters of petrol has 30% additives in it. How many liters of pure petrol should be added to the above sample so that level of additives stands reduced to 5%?

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