The average weight of 20 persons sitting in a boat had some value. A new person added to them whose weight was 49 kg only. Due to his arrival, the average weight of all the persons decreased by 5 kg. Find the average weight of first 20 persons? Select the correct option:
A) 55  B) 56  C) 57  D) 58  E) 59
20x + 49 = 21(x – 5)   X=56   ANSWER:56
<result>B</result>
The average weight of 20 persons sitting in a boat had some value. A new person added to them whose weight was 49 kg only. Due to his arrival, the average weight of all the persons decreased by 5 kg. Find the average weight of first 20 persons?