A bag contains black and white balls, numbered 1 to 9 are black, and numbers 10 to 19 are white. Randomly draw a ball from the bag, the probability of drawing a white ball is ((())/(())).
一个袋子里装有黑白两种颜色的球，1号到9号是黑球，10号到19号是白球．从袋子中任意摸出一个球，摸到白球的可能性是((())/(()))．
<gadget id="calculator">19 - 9</gadget>
<output>10</output>

<gadget id="calculator">10 / 19</gadget>
<output>10/19 = around 0.526316</output>

<result>10/19 = around 0.526316</result>