A pile of goods weighs 120 tons, and 40 tons are used up. What fraction of the total amount is left?
一堆货物重120吨，用去了40吨，还剩总数的几分之几？
<gadget id="calculator">120 - 40</gadget>
<output>80</output>

<gadget id="calculator">80 / 120</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>