The cement plant produced 420,000 tons of cement this year, an increase (1/6) compared to last year. How many tons of cement was produced last year?
水泥厂今年生产水泥42万吨，比去年增产(1/6)，去年生产水泥多少万吨？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 + (1/6)</gadget>
<output>7/6 = around 1.166667</output>

<gadget id="calculator">42 / (7/6)</gadget>
<output>36</output>

<result>36</result>