arithmetic - the average weight of 22 boys is 57 kg each boy puts on a dress whose weight is 1 kg what is the average weight of the boys now - skillgun

Solution: If each observation is increased by K, then the average also increased by K.
In the given problem average weight of 22 boys is 57 Kg. given each boy is increased by 1 Kg by their dress. So, the average also increased by 1 Kg. Hence required average is 58 Kg.