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A full can of petrol weighs 1.5 kgs. When half full it weighs 1 kg. What is the weight of the empty can?

A full can of petrol weighs 1.5 kgs. When half full it weighs 1 kg. What is the weight of the empty can? Correct Answer 0.25 Kg

Let, the weight of the empty can = XSo, ½  of the can = x +1 kg      1 part of the can = 2(x+1) kg So, 2(x+1)= 1.5 or, 2x+1 =1.5 or x =.25

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