There are 6 yellow balls and 6 red balls in a bag, all of which are the same except for their color. If one ball is drawn at random, what is the probability of drawing a yellow ball?
袋子里装有6个黄球和6个红球，除颜色外都相同，任意摸出一个球，摸出黄球的概率是多少
<gadget id="calculator">6 + 6</gadget>
<output>12</output>

<gadget id="calculator">6 / 12</gadget>
<output>1/2 = around 0.5</output>

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