A bottle of oil weighs 2.7 kg. After half of it is poured out, the weight of the bottle is 1.45 kg. What is the weight of the original oil in the bottle?
一瓶油连瓶重2.7千克，倒去一半后，连瓶重1.45千克，瓶里原有油重多少千克
<gadget id="calculator">2.7 - 1.45</gadget>
<output>1.25</output>

<gadget id="calculator">1.25 * 2</gadget>
<output>2.5</output>

<result>2.5</result>