o cups orange
g cups ginger
f cups filler
o + g + f = 400
120 </= o </= 400
0 </= g </= 80
f </= 280
a solution must contain at least 30% orange juice but not more than 20% ginger ale in addition to its other ingredients. If the punch bowl is to hold 400 cups of this solution, what are the amounts of orange juice and ginger ale?
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