The transport team wanted to transport a batch of rice to the disaster area. On the first day, 1/4 of this batch of rice was transported. The first day transported 20 tons more than the second day, and finally 180 tons were left. The total amount of this batch of rice was How many tons?
运输队要把一批大米运来灾区，第一天运了这批大米的(1/4)，第一天运的比第二天多20吨，最后剩下180吨，这批大米一共有多少吨？
<gadget id="calculator">180 - 20</gadget>
<output>160</output>

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

<gadget id="calculator">1 - (1/4) - (1/4)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">160 / (1/2)</gadget>
<output>320</output>

<result>320</result>