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A full tin of paint has a mass of 27 kg. When the same tin is 2/5 filled with paint, it has a mass of 12 kg. What is the mass of the empty tin?



The mass of empty tin is 2 kg
x= mass of tin
y=mass of paint
and equations are 2x+2y=54
and 5x+2y=60
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Let the mass of tin be x
let the mass of the paint be p 
then the first equation is 2x+2p = 54
             second            5x+2y= 60
hence the weight of empty tin is 2 kg
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