- When the person was 6 years old, their sister was half their age, meaning she was 3 years younger (6 – 3 = 3).
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That 3-year age difference never changes.
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Now the person is 70 years old, so the sister must be 70 – 3 = 67 years old.
That 3-year age difference never changes.
Now the person is 70 years old, so the sister must be 70 – 3 = 67 years old.