There are 2 red balls and 8 yellow balls in a pocket, and one ball is randomly drawn from it, what is the probability of drawing a red ball?
在一个口袋里有2个红球和8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">2 + 8</gadget>
<output>10</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>