There are 5 red balls, 3 white balls, and 2 yellow balls in a box. If you touch any one of them, what is the probability of getting a red ball?
箱子中有5个红球、3个白球、2个黄球，从中任意摸一个，摸出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>