There are 2 red balls, 3 yellow balls, and 5 blue balls in a box, what is the probability of touching the blue balls?
箱子里有2个红球，3个黄球，5个蓝球，摸到蓝球的可能性是几分之几？
<gadget id="calculator">2 + 3 + 5</gadget>
<output>10</output>

<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

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