Distribute some books to a certain class of students, and each person can get (31/7) books on average. The teacher decides to buy a few more books. After calculation, at least 24 books will be added, so that the number of books distributed to each person is an integer number. How many students are there in this class?
将一些本子分给某班学生，平均每人可分得(31/7)本，老师决定再买几本，算了一下至少还要添24本，才使每人发的书是整数本，这个班有多少名同学？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (3/7)</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">24 / (4/7)</gadget>
<output>42</output>

<result>42</result>