The output value of a certain factory in September was 400,000 yuan, which was an increase of (1/7) compared with that in August. How much was the output value in August?
某工厂九月份产值是40万元，九月份比八月份增长了(1/7)，八月份的产值是多少万元？
<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">40 / (8/7)</gadget>
<output>35</output>

<result>35</result>