There are 12 balls in a box, including 5 black balls, 4 white balls, and 3 red balls. If one ball is randomly drawn from the box, what is the probability of drawing a white ball?
盒子里有12个球，其中黑球5个，白球4个，红球3个，从盒子里任意摸出1个球，则摸到白球的可能性是多少
<gadget id="calculator">4 / 12</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>