There is a batch of rice in the warehouse. After transporting 75%, there are still 3 tons left. How many tons are there in this batch of rice?
仓库有一批大米，运走75%后，还剩3吨，这批大米原来有多少吨？
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3 / (1/4)</gadget>
<output>12</output>

<result>12</result>