There are 3 red balls and 5 blue balls in a bag. What is the probability of touching a red ball once?
一个袋子里有3个红球，5个蓝球，摸一次，摸到红球的可能性是多少．
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

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

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