The average weight of the 10-person group is 50 kg. A person left the group and the average weight of the group decreased by one kg. If one new person joins the group of remaining people, then the average weight of the group becomes 52 kg. Find the difference between the weight of the person who left the group and the person who joined the group.

The average age of Ram and Rohan is 45 years. If Aravind were to replace Ram, the average age would be 44 years; and if Aravind were to replace Rohan, the average age would be 46 years. What are the ages of Ram, Rohan and Aravind, respectively, in years?

The average of 10 observations is 40. It was realised later that an observation was misread as 31 in place of 50. Find the correct average.​

The average of 10 observations is 40. It was realised later that an observation was misread as 32 in place of 43. Find the correct average.​

The average age of 48 students of a class is 22 years. If the age of the teacher is also included, the average age of the whole group becomes 23 years. The age (in years) of the teacher is:

A batsman makes a score of 79 runs in the 18th inning and thus increases his average by 2. Find his average after 18th inning.

The average score of 7 players was initially recorded as 55. However, it was later discovered that a score of 35 had been mistakenly read as 53. Determine the correct average score.(Rounded up to two decimal places)

The average weight of x students is 62 kg. If two person whose weight are 82.5 and 78.5 left the group and a new person whose weight is 162 kg join the group, then the average becomes 65.5 kg. find x.