sam began the week with a bag of buttons. at the end of the week he had used 2/3 of the buttons, and had 20 left how many did he start with at the beginning of the week
20 is (1−2/3)=1/3(1 - 2/3) = 1/3(1−2/3)=1/3 of all the buttons.
So, Sam started with 20:(1/3)=6020:(1/3) = 6020:(1/3)=60 buttons.
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