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Question 1:

The average  marks of 35 students in a class examination is 46. Later, it was found that the marks of two students each were read as 33 instead of 23, and that of one student was read as 30 instead of 36. Find the actual average marks of the students of the class.

Question 2:

The average of 19 numbers is 58 . The average of the first 12 numbers is $63.6$ and the average of the last 8 numbers is $55.1$. If the 12 th number from the beginning is excluded, then what is the average of the remaining numbers?

Question 3:

The average price of 10 books is ₹ 150 , while the average price of 8 of these books is ₹ 135. Of the remaining 2 books, if the price of one book is 40% more than the price of the other book, then what is the price of the costlier of these two books?

Question 4:

If the average of the numbers $8,5,3, k,(k+1)$ is 7 , then what is the value of $k$ ?

Question 5:

The average of three numbers a, b and c is 63 . If the first number ' a ' is three-fourth of the sum of b and c, then the first number ' a ' is equal to:

Question 6:

4 years ago, the average age of a family of 4 members was 19 years. A baby having been born, the average age of the family is the same today. Find the present age of the baby.

Question 7:

The average of 9 numbers is 51 . Average of three of them is 49 and the average of four of the remaining numbers is 46 . What is the average of the remaining numbers?

Question 8:

The average of twelve numbers is 38 . The average of the first three numbers is 33 , that of the next four numbers is $35 \frac{1}{2}$, and that of the next two numbers is 40 . If the tenth number is less than the eleventh and twelfth numbers by 4 and 5 , respectively, then the twelfth number is:

Question 9:

The average weight of the students in a class is 56 kg. If five more students whose average weight is 58 kg join the class, the average weight of the students increases by 0.5 kg. What was the original number of students in the class?

Question 10:

The average age of 10 members of a family is 29 years. If the youngest members are twins and each is 5 years old, what was the average age (in years) of the family members at the time of birth of the twins?