The cafeteria bought a batch of wax gourds, and they have already eaten (4/5) tons, and the remaining (1/2) tons are less than the eaten ones. How many tons are there in total in this batch of wax gourds?
食堂买来一批冬瓜，已经吃了(4/5)吨，剩下的比吃了的少(1/2)吨，这批冬瓜共有多少吨？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(4/5) - (1/2)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/10) + (4/5)</gadget>
<output>11/10 = around 1.1</output>

<result>11/10 = around 1.1</result>