The canteen brings in a batch of rice and eats (4/5) tons, which is (1/4) tons more than the rest. How many tons was this batch of rice originally?
食堂运进一批大米，吃掉(4/5)吨，比剩下的多(1/4)吨．这批大米原有多少吨？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) - (1/4)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">(4/5) + (11/20)</gadget>
<output>27/20 = around 1.35</output>

<result>27/20 = around 1.35</result>