The average weight of 25 persons sitting in a boat had some value. A new person added to them whose weight was 46 kg only. Due to his arrival, the average weight of all the persons decreased by 5 kg. Find the average weight of first 25 persons?

One Answer on this Question

1. let the average of 25 person be x

   total age of a person=average×no.of person

   total age of 25 person=X×25

   =25X

   when a new person of 46kg come average decrease by 5kg(X-5)

   Total age of 26 person =25x+46

   Average age of 26 person=X-5

   A/Q

   .25X+46=26(X-5)

   25X+46=26X-130

   26X-25X=130+46

   X =176

   hence the av. of 25 person be 176kg

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