A barrel of oil weighs 200 kilograms, and 180 kilograms are used up, which is ((())/(())) of the barrel.
一桶油重200千克，用去了180千克，用去的是这桶油的((())/(()))．
<gadget id="calculator">180 / 200</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>