Average age of a family of 5 in 2010 member is 15.A new member is born in the family in 2010.Find the average age of family on 4^th birth day of youngest member.

In a scientific experiment, nine observations were taken to find out the value of a constant. The average of nine observation came out to be 85. If the average of first five observations is 82 and the average of last three observations is 95. Find the sixth observation.

Average of ten positive number is$\overline{A}$. If each number is increased by 10%, then which of the following will indicate value of $\overline{A}$.

Rajiv decided to go for dinner along with his 12 friends. He paid Rs.145, and all of his friends paid an equal amount. Later they found out that the average amount that was to be paid by all of them was 5 more than what was paid by each of Rajiiv's friend. How much money did each of his friends pay?

Amit age was 4 years when Ankita was born while Arunita was 26 years old when Ankit was born. If Ankita was 4 years old when Ankit was born, find the average age of four when Ankit was 8 years old.

Three students Andy, Bunny and Celvin scored a total marks of 76.If all the three scored 8 more marks then ratio of their marks are 5:8:7 respectively. Find the average scored by Bunny and Celvin

B  is four times of A.In 5 years B will be thrice of A .In how many years A will be half the age of B

Average marks of section A of class 10^th is 40.8 and that of section B of class10th  is 42.5.If combined average of both the section is 41.82.Find the ratio of students in section A to that of section B.

The average salary of A, B is Rs. 3500 and that of B and C is 5000,C and D is Rs. 4000. And average of D and A is 4500. Find the average salary of all  A, B, C and D.

Batting average of a batsman in his 27 innings is 47.07.In his next inning he scored some runs such that his average is increased by 3. Find the runs scored by him in his 28^th innings.

If average of $a+\frac{1}{a}$is 2K(a>0).Find the average of $a^{2}and\frac{1}{a^2}$

Average weight of 10 students is calculated.  By mistake, the digits of one of the student’s weight get interchanged, and the average weight gets increased by 5.4 kg. Find the difference of the digits of the students' weight.

(Note: No student is less than 10 kg and more than 99 kg)

Bowling 10 overs per match Kamlesh Nakerkoti picked 42 wickets in 27 matchs at an average of 23.5.In next three matchs he bowled 25 overs, conceded 63 runs and picked 8 wickets. Find his bowling average after 30 matches. 

A goes from P to Q at the speed of 40 km/hr and returned at the speed of 60 km/hr. The average speed of A during the whole journey is -

The ratio of the ages of A and B is 3:1. Four years ago the ratio was 4 : 1,Find the average age of A and B after 2 years .