Lizzy: Grace's age is 3/8th the age of her grandmother. Her grandmother is twice the age of Grace's mother. If Grace's mother is 80 years old, how old is Grace?.
Me: Hmmm, let me think. I think this is the detailed solution:
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Grace's grandmother is 2 * 80 years = 160 years old. Grace's age is 3 / 8 * 160 years = 60 years old. Final answer: 60.
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