There are 8 red balls and 4 white balls in a pocket, they are identical except for their color, what is the probability of drawing a red ball if you draw 1 ball
口袋里有8个红球和4个白球，它们除颜色外完全相同，从中摸出1个球，摸出红球的可能性是多少
<gadget id="calculator">8 + 4</gadget>
<output>12</output>

<gadget id="calculator">8 / 12</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>