There are 6 black balls and 4 white balls in a pocket. If one of the balls is drawn at random, what is the probability of getting a white ball?
口袋里有6个黑球和4个白球，任意取出其中一个球，取到白球的可能性是多少
<gadget id="calculator">4 + 6</gadget>
<output>10</output>

<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>