A batch of cement was shipped back 1200 tons for the first time, which was (1/4) more than the second time, and the second time was equivalent to the whole (4/9), how many tons of this batch of cement were there?
一批水泥，第一次运回1200吨，比第二次多运(1/4)，第二次运回的相当于全部的(4/9)，这批水泥共有多少吨？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1_200 / (5/4) / (4/9)</gadget>
<output>2_160</output>

<result>2_160</result>