There are three piles of Go pieces, each with 80 pieces. The first pile of black pieces has the same number of white pieces as the second pile, and (3/4) of the third pile is white pieces. How many sunspots are there in the third pile of chess pieces?
有三堆围棋子，每堆80枚．第一堆黑子与第二堆的白子同样多，第三堆有(3/4)是白子．第三堆棋子一共有黑子多少枚？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">80 * (1/4)</gadget>
<output>20</output>

<result>20</result>