Word Problems

How many liters of pure water must be mixed with a 4 liter mixture of 25% antifreeze to produce a 23% mixture?

First you must understand the meanings of the words in the problem. So what is the definition of mixture and antifreeze?
When you add milk to a cup of coffee or tea you are creating a mixture. Antifreeze is a fluid in a cars cooling system that is mixed with water to prevent freezing   return