Question
PSLE
Oscar and Risa have some pens. After Oscar gives 52 pens to Risa, he has 15 pens more than her. How many more pens than Risa does Oscar have at first?
2 m

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PSLE
Oscar and Risa have some pens. After Oscar gives 52 pens to Risa, he has 15 pens more than her. How many more pens than Risa does Oscar have at first?