Question
Zeph and Riordan had a total of 138 buttons. Riordan had half as many buttons as Zeph. How many buttons must Zeph give to Riordan so they have an equal number of buttons?
4 m

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Zeph and Riordan had a total of 138 buttons. Riordan had half as many buttons as Zeph. How many buttons must Zeph give to Riordan so they have an equal number of buttons?