Four small boys want to know their weights but the weighing machine only weigh objects more than40kg.

As each of the boys knows that his weight is less than this, they weigh themselves two at a time.Tlre results of all possible paired weighings are : 48 kg, 49 kg, 52k9,53 kg, 56 kg and 57 kg,Mohinda, the tallest of the four boys, weighs the most.what does he weigh ?1) 29kg2) 30kg3) 31 kg4) 32 kg