A gas contain weights 1.8 kg, it can fill up to 18 L how much does 1 L gas weights?

a gas can weights 1,8 kg. it can fill up to 18 L. When it's filled to 2/3 the gas can weights 11.4 kg how much does 1L weights?
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1 Answer

The gasoline can weighs 1.8kg when empty. When it's ⅔ full it contains ⅔×18=12L of fuel, so 12L of fuel plus the can weigh 11.4kg, therefore the fuel weighs 11.4-1.8=9.6kg. 1L of fuel weighs 9.6/12=0.8kg. 

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