There are 2 red balls, 3 white balls, and 5 black balls in the pocket. If a ball is randomly drawn, what is the probability of drawing a black ball?
口袋中有2个红球，3个白球，5个黑球，任意摸出一个球，摸到黑球的概率可能性多少
<gadget id="calculator">2 + 3 + 5</gadget>
<output>10</output>

<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>