There are 5 red balls, 2 yellow balls, and 3 white balls in a box, what is the probability of getting a red ball at the same time?
一个盒子里装有5个红球，2个黄球，3个白球，一次摸到红球的可能性是多少．
<gadget id="calculator">5 + 3 + 2</gadget>
<output>10</output>

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

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