There are three piles of Go pieces, each with 70 pieces. There are as many white pieces in the first pile as there are black pieces in the second pile, and (2/5) of the third pile are black pieces. How many sunspots are there in these three piles of chess pieces?
有三堆围棋子，每堆70枚．第一堆的白子与第二堆的黑子同样多，第三堆有(2/5)是黑子．这三堆棋子中一共有多少枚黑子？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">70 * (2/5)</gadget>
<output>28</output>

<gadget id="calculator">70 + 28</gadget>
<output>98</output>

<result>98</result>