A barrel of oil weighs 180 kilograms, and after half of the oil is used, there is still 95 kilograms in the barrel. Do you know how many kilograms this barrel of oil weighs?
一桶油，连桶重180千克，用去一半油后，连桶还有95千克．你知这桶油有多少千克吗？
<gadget id="calculator">180 - 95</gadget>
<output>85</output>

<gadget id="calculator">85 * 2</gadget>
<output>170</output>

<result>170</result>