When the older sibling was 12 years old, the sister was half that age:
12 ÷ 2 = 6
This means the sister is six years younger. That age difference remains the same as both siblings grow older.
Now the older sibling is 25, so subtract the six-year difference:
25 − 6 = 19
The sister is now 19 years old.
The common mistake is dividing 25 by two, but the sister was half the older sibling’s age only when they were 12 and 6.
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