There are 80 students in the third grade of Hope Primary School, the number of students in the fourth grade is the third grade (9/10), and the number of the fifth grade is the fourth grade (8/9). How many students do you hope there are in the fifth grade of elementary school?
希望小学三年级有学生80人，四年级人数是三年级的(9/10)，五年级的人数是四年级的(8/9)．希望小学五年级有学生多少人？
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">80 * (9/10) * (8/9)</gadget>
<output>64</output>

<result>64</result>