Lizzy: Isabella is twice as old as Antonio. In 18 months, she will be 10 years old. How many months old is Antonio?.
Me: Hmmm, let me think. I think this is the detailed solution:
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First, we determine that Isabella will be 10 * 12 = 120 months old at age 10, to find a number to compare her age to Antonio's with. Then we subtract the 18 months from the total of 120 months to find 120 - 18 = 102 months, which is the age Isabella is currently. Since at 102 months old Isabella is twice as old as Antonio, we take 102 / 2 = 51 months as Antonio's age. Final answer: 51.
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