A family consists of grandparents, parents and three grandchildren. The average age of the grandparents is 67 years that…

If the average of m numbers is n<sup>2</sup> and that of n numbers is m<sup>2</sup> , then the …

The body weight of seven students of a class is recorded as 54 kg, 78 kg, 43 kg, 82 kg, 67 kg, 42 kg and 75 kg. What is …

The average age of students of a class is 15.8 years. The average age of boys in the class is 16.4 years and that of the…

Nine persons went to a hotel for taking their meals. Eight of them spent Rs.12 each on their meals and the ninth spent R…

The average of 11 results is 50. If the average of the first six results is 49 and that of the last six is 52, the sixth…

There are three categories of jobs A, B and C. The average salary of the student who got the job of A and B categories i…

If the mean of 4 observations is 20, when a constant 'c' is added to each observation, the mean becomes 22. The value of…