Tini, an elementary school student, wanted to play on a seesaw after school. Her friend Bobi arrived unexpectedly and they started playing. The problem is: Bobi was heavier than Tini.
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Tini, an elementary school student, wanted to play on a seesaw after school. Her friend Bobi arrived unexpectedly and they started playing. The problem is: Bobi was heavier than Tini.
