From I, Now, G is heavier than F, who is heavier than J, who is not the lightest. I is heavier than only one person. G is not the heaviest. So, we get the following arrangement: __ > G > F > J > I > __ So, F is the third heaviest person. From II, Now, only three persons are heavier than J, who is heavier than I. I is not the lightest. G is heavier than F and neither of them is lighter than J. So, we get the following possible arrangements, G > __ > F > J > I > __ __ > G > F > J > I > __ G > F > __ > J > I > __ Statement II is not sufficient to answer the question.
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