A machine tool factory produces 400 machines in September, which is 1/7 more than in August. How many machines are produced in August?
某机床厂九月分生产机器400台，比八月份增产(1/7)，八月份生产机器多少台？
<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">400 / (8/7)</gadget>
<output>350</output>

<result>350</result>