There are 3 red balls and 5 white balls in a box, what is the probability of picking a white ball at random?
盒子中有3个红球和5个白球，从中任意取出一个白球的可能性是多少．
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<result>5/8 = around 0.625</result>