The output of wheat this year is 240 kg, which is 1/7 more than that of last year. How many kg of wheat was produced last year?
今年产小麦240千克，比去年增产(1/7)，去年产小麦多少千克．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 + (1/7)</gadget>
<output>8/7 = around 1.142857</output>

<gadget id="calculator">240 / (8/7)</gadget>
<output>210</output>

<result>210</result>