Books cost 50 cents and pamphlets cost 15 cents at the book sale. If Mr. Jones spent $90 and purchased 15 more pamphlets than he did books, how many pamphlets did he buy?

“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 .

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