This is a prep question for the National Science Olympiad (sample paper).
Four bags were to be weighed but the scale could weigh only weights in excess of 100 kg. If the bags were weighed in pairs and the weights were found to be 103, 105, 106, 107 and 109, then the weight of the lightest bag is
options are (A) 50 kg (B) 51 kg (C) 49 kg (D) 52 kg
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