There are 147 students in grade four, the number of students in grade five is equal to that of grade four (2/3), and the number of students in grade six is equivalent to that of grade five (6/7). How many students are there in grade six?
四年级有学生147人，五年级学生的人数是四年级的(2/3)，六级学生的人数相当于五年级的(6/7)．六年级有学生多少人？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">147 * (2/3) * (6/7)</gadget>
<output>84</output>

<result>84</result>