Question
Fred gave 15 of his pens to Brandon, 15 of his pens to Gabriel and 15 of his pens to Archie. He then had 4 pens left. How many pens had he at first?
4 m

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Fred gave 15 of his pens to Brandon, 15 of his pens to Gabriel and 15 of his pens to Archie. He then had 4 pens left. How many pens had he at first?