Average - General Questions

The average of 7 numbers is 58. When one more number is added, the average becomes 62. What is the new number?

The average marks of a class of 42 students is 45 and that of another class of 45 students is 60. What is the average of all the students together?

The average weight of 9 persons increases by 2.5 kg when a new person replaces one of them weighing 49 kg. What is the weight of the new person?

What is the average of the first 51 even numbers?

The average weight of 6 persons increases by 2.5 kg when a new person replaces one of them weighing 74 kg. What is the weight of the new person?