There are 60 go pieces that are divided into 20 piles on average, among which the number of piles with all black pieces and all white pieces is the same, there are 6 piles with only 1 black piece, and 11 piles with at least 2 white pieces. So how many sunspots are there in total?
有60枚围棋子平均分成20堆，其中全是黑子和全是白子的堆数相同，只有1枚黑子的有6堆，至少有2枚白子的有11堆．那么共有多少枚黑子．
<gadget id="calculator">60 / 20</gadget>
<output>3</output>

<gadget id="calculator">11 - 6</gadget>
<output>5</output>

<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<gadget id="calculator">1 * 6</gadget>
<output>6</output>

<gadget id="calculator">20 - 5 - 5 - 6</gadget>
<output>4</output>

<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<gadget id="calculator">15 + 6 + 8</gadget>
<output>29</output>

<result>29</result>