OSTRICHESMath brain teasers require computations to solve.Two ostrich breeders, Mandy and Marcia, were talking one day, and noticed that if Mandy sold Marcia seven ostriches, Mandy would have exactly as many ostriches as Marcia. On the other hand, if Marcia sold Mandy seven ostriches, then Mandy would have exactly twice as many ostriches as Marcia. How many ostriches did each have? 
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