Shenzhen has a bumper harvest of lychees this year, with an output of 150,000 tons, an increase of 20% over last year. How many tons of lychees were produced last year?
深圳今年荔枝大丰收，产量达到15万吨，比去年增产两成，去年荔枝的产量是多少万吨？
<gadget id="calculator">20 / 100</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">15 / (6/5)</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>