There are 3 classes in the fifth grade of the experimental primary school, the first class has 42 students, the number of students in the second class is that of the first class (5/6), the number of students in the third class is that of the second class (8/7), how many students are there in the third class?
实验小学五年级有3个班，一班有42人，二班的人数是一班的(5/6)，三班的人数是二班的(8/7)，三班有学生多少人？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">8 / 7</gadget>
<output>8/7 = around 1.142857</output>

<gadget id="calculator">42 * (5/6) * (8/7)</gadget>
<output>40</output>

<result>40</result>