Ten years ago, the person was 20 years old.
Add those ten years to determine their current age:
20 + 10 = 30
The question then asks how old the person will be 30 years later, meaning 30 years from now:
30 + 30 = 60
The correct answer is 60 years old.
A common mistake is to add only 30 to the original age of 20, but that ignores the ten years that have already passed.
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