There are 5 red balls and 3 white balls in a sealed opaque bag. Lulu reaches out and grabs 1 ball at random. What is the probability of catching a red ball?
在一个密封的不透明的袋子里装了5个红球、3个白球，露露伸手任意抓1个球，抓到红球的可能性是多少．
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>