There are 2 white chess pieces and 3 black chess pieces in a cardboard box. If one is randomly touched, what is the probability of touching a black chess piece?
一个纸箱内装有白色棋子2枚，黑色棋子3枚，随意摸1枚，摸到黑色棋子的可能性是多少
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>