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A mixture weighs 7.8 grams. It consists of ingredients X, Y, and Z in the ratio 2:5:6, respectively, by weight. How many less grams of ingredient X than ingredient Z are in the mixture?

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GMAT Problem-solving questions consist of topics such as arithmetic, algebra, geometry, and more. 
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A mixture weighs 7.8 grams. It consists of ingredients X, Y, and Z in the ratio 2:5:6, respectively, by weight. How many less grams of ingredient X than ingredient Z are in the mixture?






 
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