There are 4 red balls, 2 white balls, and 6 yellow balls in the cloth bag. Now touch one of them, what is the probability of touching a red ball?
布袋里有4个红球，2个白球，6个黄球，现在从中摸一个，摸到红球的可能性是多少．
<gadget id="calculator">4 + 2 + 6</gadget>
<output>12</output>

<gadget id="calculator">4 / 12</gadget>
<output>1/3 = around 0.333333</output>

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