There are 172 black pieces and 97 white pieces. Each time two black and white pieces are taken away, after how many times the number of black pieces left is 6 times the number of white pieces.
有黑棋子172只，白棋子97只，每次拿走黑、白棋子各2只，拿多少次后，剩下的黑棋子只数是白棋子只数的6倍．
<gadget id="calculator">6 * 97</gadget>
<output>582</output>

<gadget id="calculator">582 - 172</gadget>
<output>410</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">12 - 2</gadget>
<output>10</output>

<gadget id="calculator">410 / 10</gadget>
<output>41</output>

<result>41</result>