Luhua Village harvested 92 tons of rice this year, an increase of 15% over last year. How many tons less rice was harvested last year than this year?
芦花村今年收稻谷92吨，比去年增产了15%，去年比今年少收稻谷多少吨？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 + (3/20)</gadget>
<output>23/20 = around 1.15</output>

<gadget id="calculator">92 / (23/20)</gadget>
<output>80</output>

<gadget id="calculator">92 - 80</gadget>
<output>12</output>

<result>12</result>