Divide 90 Go pieces into three piles. There are as many white pieces in the first pile as there are black pieces in the second pile, and the white pieces in the third pile belong to black pieces (3/2). How many sunspots are there in these three piles?
将90枚围棋棋子平均分成三堆．第一堆的白子和第二堆的黑子一样多，第三堆的白子是黑子的(3/2)．这三堆一共有黑子多少枚？
<gadget id="calculator">90 / 3</gadget>
<output>30</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">1 + (3/2)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">30 / (5/2)</gadget>
<output>12</output>

<gadget id="calculator">12 + 30</gadget>
<output>42</output>

<result>42</result>