There are 8 red balls, 4 white balls and 4 yellow balls of the same size in a pocket, and one ball is randomly drawn from among them, what is the probability of drawing a red ball?
口袋里有大小相同的8个红球、4个白球和4个黄球，从中任意摸出1个球，摸出红球的可能性是多少．
<gadget id="calculator">8 + 4 + 4</gadget>
<output>16</output>

<gadget id="calculator">8 / 16</gadget>
<output>1/2 = around 0.5</output>

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