Riko and Kate each baked some cookies. To begin with, the ratio of Riko’s cookies to Kate’s cookies was 2 : 3. After Kate gave ½ of her cookies to Riko, Riko had 21. How many cookies did Riko have at first? Please help!!

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“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .