There are 3 piles of the same number of Go pieces, the first pile has the same number of black stones as the second pile of white stones, and the third pile of black stones accounts for (2/5) of all the black stones. Put these 3 piles of chess pieces together, what percentage of all the chess pieces are white pieces?
有3堆同样多的围棋子，第一堆的黑子和第二堆的白子一样多，第三堆的黑子占全部黑子的(2/5)．把这3堆棋子集中到一起，白子占全部棋子的几分之几？
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">9 - 5</gadget>
<output>4</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>