There are 240 students in the sixth grade of Yucai Primary School, the number of students in the fifth grade is that of the sixth grade (7/8), the number of the fourth grade is less than that of the fifth grade (1/5), and how many fewer students are in the fourth grade than the fifth grade?
育才小学六年级有240人，五年级的人数是六年级的(7/8)，四年级比五年级的人数的少(1/5)，四年级比五年级少了多少人？
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">240 * (7/8) * (1/5)</gadget>
<output>42</output>

<result>42</result>