There are 40 minutes in a class, and the time for students to explore and practice accounts for (3/4), how many minutes did students spend on exploring and practicing.
一节课有40分钟，学生探究和练习的时间占了(3/4)，学生探究和练习用了多少分钟．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">40 * (3/4)</gadget>
<output>30</output>

<result>30</result>