Average age of a group of 15 boys is 24 years. A boy having age 13 years leaves the group. A new boy joins the group and the average increases by 1 year. What is the age of the new boy?

The average age of 12 players and their coach is 32 years. The average age of first 5 players is 28 years and average age of the remaining 7 players is 26 years. What is the age of the coach?

A group of people contains men, women and children. If 40% of them are men, 35% are women and rest are children. and their average weights are 70 kg,60 kg and 30 kg, respectively. The average weight of the group is:

A class of 30 students appeared in a test. The average score of 12 students is 80 and that of the rest is 75. What is the average score of the class?

Which of the following statements(s) is/are correct?

I. The average of 24 numbers is 22. If the average of first 9 numbers is 18, then average of remaining numbers will be 24.4.

II. Average of 149, 223, 520, 287 and 251 is 286.

The average age of a group of 9 members is 42 years. The age of the eldest member is 58 years. If we exclude that eldest member from the group, then what will be the average age of the remaining members?

Typist P can type a sheet in 6 minutes, typist Q in in 7 minutes and typist R in 9 minutes. The average number of sheets typed per hour per typist if all three typists are typing, is____________.

In a Diwali gift packaging contest, the average weight of 20 gift boxes was calculated to be 65 kg. However, it was later discovered that the weight of one gift box was incorrectly recorded as 76 kg instead of the correct weight of 66 kg. What is the correct average weight of the gift boxes?

The average cost of buying Diwali sweets and decorative items for 4 friends is Rs.150 each. If three of them spent Rs.120, Rs.180, and Rs.140, what did the fourth friend spend?

The mean of 21 observations is 42. If out of 21 given observations, the mean of the first 11 observations is 50 and the mean of the last 11 observations is 35, then the 11™ observation will be: