First find the number of cups of potatoes Carrie adds per one cup of turnips: 5 cups potatoes / 2 cups turnips = <<5/2=2.5>>2.5 cups potatoes/cup turnips
Then divide the number of cups of potatoes she has that that ratio to find the number of cups of turnips she adds: 20 cups potatoes / 2.5 cups potatoes/cup turnips = <<20/2.5=8>>8 cups turnips
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