Question
Peter and Oliver shared some erasers. Peter took 511 of the erasers. After Peter lost 12 erasers, Oliver had thrice as many erasers as Peter. How many erasers did Oliver have in the end?
4 m

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Peter and Oliver shared some erasers. Peter took 511 of the erasers. After Peter lost 12 erasers, Oliver had thrice as many erasers as Peter. How many erasers did Oliver have in the end?