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Half of 12 is 6, thus 12 years old plus half her age (6 years) = 18 years old. Unless however there is some hidden trick in logic to this. 18 is incorrect, half of 18 is 9. 9 + 12 = 21 correct answer is 24. sally's age is 12 years plus half her age. 12 + 12 = 24. half of 24 is 12
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