A factory produces 100 machines in February, which is 1/5 more than in January. How many machines are produced in January?
某厂二月份生产机器100台，比一月份多生产(1/5)，一月份生产多少台．
<gadget id="calculator">1 / 5</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">100 / (6/5)</gadget>
<output>250/3 = around 83.333333</output>

<result>250/3 = around 83.333333</result>