There is a pile of Go pieces, in which the number of black pieces is twice that of white pieces. Now take out 5 black pieces and 3 white pieces from this pile of pieces. pieces, how many original black pieces are there.
有一堆围棋子，其中黑子个数是白子的2倍，现在从这堆棋子中每次取出5枚黑子和3枚白子，取了若干次以后，白子全部取尽了，而黑子还剩下10枚，原来的黑棋子有多少枚．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">6 - 5</gadget>
<output>1</output>

<gadget id="calculator">10 / 1</gadget>
<output>10</output>

<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<gadget id="calculator">50 + 10</gadget>
<output>60</output>

<result>60</result>