The ratio of the number of cups of chopped onions to the cups of chopped cilantro in a salsa recipe is 4:3. if the recipe calls for 2/3 cup of chopped onion, how many cups of chopped cilantro are needed?

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4/3 = (2/3)/x
4x = 3 (2/3)
4x = 2
X = 2/4
X = 1/2