The second group of students collected 120 used batteries from January to March, which is 1/5 more than planned. How many batteries are planned to be collected?
第二小组同学1～3月份收集废旧电池120节，比计划多收集了(1/5)，计划收集多少节？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">120 / (6/5)</gadget>
<output>100</output>

<result>100</result>