Problems on Averages

The average age of husband, wife and their child $3$years ago was $27$years and that of wife and the child $5$years ago was $20$years. The present age of the husband is:

The total of the ages of Amar, Akbar and Anthony is 80 years. What was the total of their ages three years ago ?

The average score of Sehwag in $10$ innings was $77$ runs. In the ${11}^{\mathrm{th}}$ innings he had scored zero runs. The overall average score of Sehwag in all the $11$ innings was:

If a train maintains an average speed of $40 \mathrm{km}/\mathrm{hr}$ an hour it arrives at its destination punctually. If however, the average speed is $35 \mathrm{km}/\mathrm{hr}$ an hour it arrives$15 \mathrm{minutes}$  late. Find the length of the journey in km.

A student finds the average of $10, 2$numbers. If the digits of one of the numbers is interchanged, the average increases by $3.6$. The difference between the digits of the $2$-digit number is-

A man had $7$ children. When their average age was $12$ years, a child ages $6$ years died. The average age of remaining six children is-

The average age of a jury of $5$ is $40$. If a member aged $35$ resigns and a man aged $25$ becomes a member, then the average age of the new jury is

A man travels a distance of 24 km at $6 \raisebox{1ex}{$\mathrm{km}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{hr}$}\right.$ another distance of $24 \mathrm{km}$ at $8 \raisebox{1ex}{$\mathrm{km}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{hr}$}\right.$ and a third distance of $24 \mathrm{km}$ at $12 \raisebox{1ex}{$\mathrm{km}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{hr}$}\right.$. His average speed for the whole journey (in$\raisebox{1ex}{$\mathrm{km}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{hr}$}\right.$) is _____.

What will be the average speed of a car with speed 80 km/h is also included?

A set of five two-digit integers numbers is given. Average of first and third number is the second number. The fourth number is half of the first number. Sum of first, second and fourth numbers is $134$. The second number is (A) and the average of five numbers is (B). The fifth number is $55$. What can be the values of (A) and (B) respectively?

The average age of 11 students and their teacher is 16 years. The average age of the first seven students is 14 years and that of the last fours 10 years. What is the teacher's age?

The average of $7$ consecutive numbers is $18$. The third smallest of these number is:

Ages of two persons differ by 8 years. If 6 year ago, the elder one be 5 times as old the younger one, find their present age ?

The average age of $8$ men, $7$ women and $1$ boy is $45$ years and that of $8$ men being $48$ years and $7$ woman being $46$ years. Determine the age of boy.

The average age of seven boys sitting in a row facing north is $26 \mathrm{years}$. If the average age of the first three boys is $19 \mathrm{years}$ and that of the last three boys is $32 \mathrm{years}$, then what is the age of the boy sitting in the middle of the row?

A man goes from Mysore to Banglore at a uniform speed of $40 \mathrm{km}/\mathrm{hr}$  and comes back to Mysore at a uniform speed of $60 \mathrm{km}/\mathrm{hr}$. His average speed for the whole journey is

A car completes $750$ km in $12$ hr and next $250$ km in $8$ hr. Find the average speed of car.

Jignesh had to cover a certain distance in certain duration of time. He travelled at $80\%$ of the average speed required for $60\%$ of the time. For the remaining $40\%$ of the time he needed to travel at ______$\%$ of the average speed required.

A cyclist rides 24 km at 16 km per hour and a further 36 km at 15 km per hour. Find his average speed for the journey.

The average of the first three numbers is double of the fourth number. If the average of all the four numbers is 12, find the 4th number.