1/2.
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One fourth cup doubled is one half cup, since 1/4 + 1/4 = 2/4, or 1/2.
1/4 also equals .25 right? .25 + .25 = .50 = 1/2 or you could say 1/4 x 2 = 2/4 = 1/2
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3/4 of a cup doubled is 6/4 of a cup, which equals 1 1/2 cups