One waste battery can pollute the surrounding soil of about 140 square decimeters. During the environmental protection activities, the students of Hope Elementary School picked up 60 waste batteries, which reduced the land pollution of how many square meters.
一节废旧电池能使周围约140平方分米的土壤受到污染，希望小学的同学在环保活动中，捡起了60节废旧电池，这样就减少了多少平方米的土地污染．
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">140 * (3/5)</gadget>
<output>84</output>

<result>84</result>