Dongfeng Machine Tool Factory produced 600 machine tools in May, an increase of (1/5) compared with April. How many machine tools were produced in April?
东风机床厂五月份生产机床600台，比四月份增产(1/5)．四月份生产机床多少台？
<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">600 / (6/5)</gadget>
<output>500</output>

<result>500</result>