Question 1206352
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        Juice concentrate is fruit juice in liquid form
        from which most of the water has been extracted.



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20 liters is the total volume of the mixture.


It consists of 1 part of juice and 4 parts of water (equal parts by volume).


In all, there are 4+1 = 5 equal parts; so each part is 20/5 = 4 liters.


Thus, 4 liters of juice and 4*4 = 16 liters of water are used.    <U>ANSWER</U>
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Solved.