Xiao Ming's mother bought a bottle of salad oil, which weighed 5.6 kilograms. After half of it was used up, the bottle still weighed 2.85 kilograms. How much does the bottle weigh?
小明的妈妈买了一瓶色拉油，连瓶共重5.6千克，用去一半后连瓶还重2.85千克，问瓶重多少千克？
<gadget id="calculator">5.6 - 2.85</gadget>
<output>2.75</output>

<gadget id="calculator">2.75 * 2</gadget>
<output>5.5</output>

<gadget id="calculator">5.6 - 5.5</gadget>
<output>0.1</output>

<result>0.1</result>