There are 2 yellow balls and 3 white balls in a pocket. They are identical except for their color. If you draw a ball from the pocket at random, what is the probability of getting a yellow ball?
一个口袋里装有2个黄色球3个白色球，它们除了颜色外完全相同，从口袋里任意摸出一个球，摸到黄色球的可能性是多少．
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>