There are a bunch of black pieces and white pieces, take away 10 black pieces, and the remaining black pieces belong to the white pieces (1/2); take away 5 white pieces, and the remaining white pieces belong to the black pieces ( 1/3), the total number of black pieces and white pieces.
有一堆黑棋子和白棋子，取走10个黑棋子，剩下的黑棋子是白棋子的(1/2)；再取走5个白棋子，剩下的白棋子个数是黑棋子的(1/3)，原来黑棋子和白棋子一共多少个．
<gadget id="calculator">10 * 2</gadget>
<output>20</output>

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

<gadget id="calculator">10 * (1/3)</gadget>
<output>10/3 = around 3.333333</output>

<gadget id="calculator">5 - (10/3)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">20 + (5/3)</gadget>
<output>65/3 = around 21.666667</output>

<gadget id="calculator">2 - (1/3)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">(65/3) / (5/3)</gadget>
<output>13</output>

<gadget id="calculator">13 - 10</gadget>
<output>3</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">13 + 6</gadget>
<output>19</output>

<result>19</result>