Average MCQs

The average age of a class of 6 girls is x years. Four new girls having ages x - 2, x + 2, x + 4 and x + 6 join the class. What is the new average age (in years) of the class?

Find the average of cubes of first 49 positive integers.

The average revenues of 7 consecutive years is Rs. 83 lakhs. The average of first 4 years is Rs. 78 lakhs and that of last 4 years is Rs. 90 lakhs, find the revenue for the 4th year.

The average of the marks of 25 students in a class, in an examination was calculated to be 19. Later, the teacher realized that the marks of two students were taken as 18 and 19 respectively, instead of 14 and 15. Find the new actual average marks of the class.

If the average of s number is r4 and the average of r numbers is s4, then find the average of all r + s numbers?

The average of 22 number is 52. The average of the first 8 numbers is 48 and the average of next 11 number is 54 the 20th number is 7 less than the 21st number and 21st number is 4 more than 22nd number. What is the average of the 20th and 22nd number?

The average age of 7 members of a family is 40 years. In the family, there are three men, three women and one boy. If the average age of three men is 48 years and average age of three women is 44 years, then the age of the boy is:

The average of marks obtained by A and B is 15 less than that of average marks obtained by B and C. If the marks obtained by C is 65, What is the marks obtained by A?

The numbers of students in section A and section B of a class are 50 and 62, respectively. The average score in mathematics of all students is 75. If the average score of students in section A is 20% more than that of students in section B, then what is the average score of students in section A (correct to one decimal place)?