Lizzy: John is twice as old as Mary and half as old as Tonya. If Tanya is 60, what is their average age?.
Me: Hmmm, let me think. I think this is the detailed solution:
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John is 30 because 60 / 2 = 30. Mary is fifteen because 30 / 2 = 15. Their total age is 105 because 60 + 30 + 15 = 105. Their average age is 35 because 105 / 3 = 35. Final answer: 35.
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