A total of 80 people in the fourth grade participated in the environmental protection team, which was (4/5) the number of fifth graders participating in the environmental protection team. The number of sixth graders participating in the environmental protection team is the fifth grade (9/10), how many people in the sixth grade participating in the environmental protection team?
四年级共有80人参加环保小组，是五年级参加环保小组的人数的(4/5)．六年级参加环保小组的人数是五年级的(9/10)，六年级参加环保小组的有多少人？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">80 / (4/5)</gadget>
<output>100</output>

<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">100 * (9/10)</gadget>
<output>90</output>

<result>90</result>