Question 1200234
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According to the text and to the context, there is the formula

    4m = z,

where m represents miles and z represents number of ounces of water.


If he hikes m= 20 miles, then the number of ounces of water z is

     4*20 = 80 ounces.


<U>ANSWER</U>.  80 ounces of water.
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