Question: Michaela is ten years older than her brother Juan. When Juan was five years old, Michaela was twice his height. Now that Michaela is thirty-one

Michaela is ten years older than her brother Juan. When Juan was five years old, Michaela was twice his height. Now that Michaela is thirty-one years old, she is six inches shorter than Juan. Explain why there must have been a time when Michaela and Juan were exactly the same height.

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