On Children's Day, a children's shopping mall is planning a lottery promotion. Put 2 red balls, 5 yellow balls, 3 blue balls, and 30 white balls into the lottery box, the red ball is the first prize. What is the probability of getting the first prize?
六一儿童节，某儿童商场正在策划摸奖促销．摸奖箱中放入2个红球，5个黄球，3个蓝球，30个白球，摸到红球是一等奖．摸到一等奖的可能性为多少．
<gadget id="calculator">2 + 5 + 3 + 30</gadget>
<output>40</output>

<gadget id="calculator">2 / 40</gadget>
<output>1/20 = around 0.05</output>

<result>1/20 = around 0.05</result>