Question
PSLE
Mark had 36 more erasers than Oliver at first. Oliver gave 9 of his erasers to Mark. Mark now has 3 times as many erasers as Oliver. How many erasers did Oliver have at first?
3 m

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PSLE
Mark had 36 more erasers than Oliver at first. Oliver gave 9 of his erasers to Mark. Mark now has 3 times as many erasers as Oliver. How many erasers did Oliver have at first?