There are two boxes of black and white pieces, and the number of black pieces is twice that of white pieces. If 4 black stones and 3 white stones are taken each time, after the white stones are taken, there are still 16 black stones left. Q: How many sunspots are there?
有黑、白棋子各一盒，黑子的数目是白子的2倍．如果每次取4枚黑子、3枚白子，白子取完后，还剩16枚黑子．问：黑子有多少枚．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<gadget id="calculator">32 + 16</gadget>
<output>48</output>

<result>48</result>