A transport team transports a batch of grain, 25% of the total amount is transported on the first day, and 35% of the total amount is transported on the second day. It is known that the first day transports 120 tons less than the second day. How many tons is this batch of grain in total?
某运输队运一批粮食，第一天运总数的25%，第二天运总数的35%，已知第一天比第二天少运120吨，这批粮食共多少吨？
<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(7/20) - (1/4)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">120 / (1/10)</gadget>
<output>1_200</output>

<result>1_200</result>