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Mixture Mixing

Algebra

I have a 100 ml mixture that is 20% isopropyl alcohol (80 ml of water and 20 ml of isopropyl alcohol).

How much more alcohol do I need to add to make the mixture 25% alcohol?

More than 5 ml Exactly 5 ml Less than 5 ml

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by Agnishom Chattopadhyay

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