First find the total number of minnows by dividing the number of red minnows by the percentage of minnows that are red: 20 minnows / 40% = 50 minnows
Then subtract the percentages of red- and green-bellied minnows to find the percentage of white-bellied minnows: 100% - 40% - 30% = 30%
Then multiply the total number of minnows by the percentage that have white bellies: 30% * 50 minnows = <<30*.01*50=15>>15 minnows
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