Mary and her twin Teri collected a total of 450 Pokemon trading cards. Their big sister ann collected 1/2 as many as Teri. Teri collected twice as much as mary. How many cards did each girl collect...

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Mary and her twin Teri collected a total of 450 Pokemon trading cards. Their big sister ann collected 1/2 as many as Teri. Teri collected twice as much as mary. How many cards did each girl collect...

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