A pile of black and white Go pieces, 10 white pieces are removed from it, the ratio of the number of remaining black pieces to the number of white pieces is 1:2, after that, 5 pieces of black pieces are taken away, the ratio of the number of remaining black pieces to the number of white pieces is 1: 3. So how many Go pieces are there in this pile? (even ratio)
一堆黑、白围棋子，从中取走白子10粒，余下的黑子数与白子数之比为1：2，此后，又取走黑子5粒，余下的黑子数与白子数之比为1：3，那么这堆围棋子原来共有多少粒？(连比)
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/2) - (1/3)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">5 / (1/6)</gadget>
<output>30</output>

<gadget id="calculator">30 + 10</gadget>
<output>40</output>

<gadget id="calculator">30 * (1/2)</gadget>
<output>15</output>

<gadget id="calculator">40 + 15</gadget>
<output>55</output>

<result>55</result>