Mathematics, 06.05.2021 18:00 fatherbamboo

Mr. Jensen bought some pens at a school supply store, including 15 black pens. 30% of all the pens he bought were black.
How many pens did Mr. Jensen buy in all?

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Mr. Jensen bought some pens at a school supply store, including 15 black pens. 30% of all the pens...