one good question for checking the apptitude

If you want to try and trick people then i would suggest going fora weight than its obvious then you think about it because it has become generalised into conversation, such as ton.. as the old trick does.. if a ton of bricks and a ton of feathers from a tall building, which hits the ground first? This draws away the attention of the weight and it has tricked many people when said to them :)

most obvious answer my dear friend that, "both are equal"

Since you are talking about weight, not a sized amount, they are the same. 1 kg = 1 kg