There is a batch of coal at the station, 210 tons are transported away on the first day, and the remaining 60% is transported away on the second day. At this time, the ratio of the remaining tons to the removed tons is 1:5. How many tons is this batch of coal?
车站有一批煤，第一天运走210吨，第二天运走余下的60%，这时剩下的吨数与运走的吨数之比是1：5，这批煤有多少吨？
<gadget id="calculator">210 * 5</gadget>
<output>1_050</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">210 * (3/5)</gadget>
<output>126</output>

<gadget id="calculator">210 * (3/5) * 5</gadget>
<output>630</output>

<gadget id="calculator">1_050 - 126 - 630</gadget>
<output>294</output>

<gadget id="calculator">210 + 294</gadget>
<output>504</output>

<gadget id="calculator">(3/5) * 5</gadget>
<output>3</output>

<gadget id="calculator">5 - (3/5) - 3</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">504 / (7/5)</gadget>
<output>360</output>

<result>360</result>