Fill a glass with water and pour water into an empty jar. If 2 cups of water are poured, the total weight of the can is 0.6 kg; if 5 cups of water are poured, the total weight of the can is 0.975 kg. How much does this empty can weigh?
用一个杯子盛满水向一个空罐里倒水．如果倒进2杯水，连罐共重0.6千克；如果倒进5杯水，连罐共重0.975千克．这个空罐重多少千克．
<gadget id="calculator">0.975 - 0.6</gadget>
<output>0.375</output>

<gadget id="calculator">0.375 / 3</gadget>
<output>0.125</output>

<gadget id="calculator">0.125 * 2</gadget>
<output>0.25</output>

<gadget id="calculator">0.6 - 0.25</gadget>
<output>0.35</output>

<result>0.35</result>