In one batch, 15 bags are transported for the first time, and 200 bags are transported for the second time, leaving (2/7) of the total. How many bags of this batch of chemical fertilizers?
一批化，第一次运走15袋，第二次运走200袋，还剩下总数的(2/7)．这批化肥一共多少袋？
<gadget id="calculator">15 + 200</gadget>
<output>215</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">215 / (5/7)</gadget>
<output>301</output>

<result>301</result>