The school held a "Traffic Safety Knowledge" contest, with 12 questions in total. The possibility of drawing multiple-choice questions is (1/4), how many multiple-choice questions need to be designed.
学校举行"交通安全知识"竞赛，题目分为填空、选择两类，共12道题．要求抽到选择题的可能性是(1/4)，需要设计多少道选择题．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">12 * (1/4)</gadget>
<output>3</output>

<result>3</result>