Question
Billy and Riordan shared some buttons. Billy took 511 of the buttons. After Billy lost 10 buttons, Riordan had twice as many buttons as Billy. How many buttons did Riordan have in the end?
4 m

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Billy and Riordan shared some buttons. Billy took 511 of the buttons. After Billy lost 10 buttons, Riordan had twice as many buttons as Billy. How many buttons did Riordan have in the end?