There  were 32 teachers in a school and their average age is 37.  Two of them retired at the age of 55 and two others of ages 21 and 25 joined in their places.  What is the average  age of the  teachers now ?

Average age of 20 teachers in the school is 34 when a 55 year old teacher retired another of 35 joined, find the present average?

A family consists of grand parents, parents and three grand children.  The  average age the  grand parents is 67 years, that of the parents is 35 years and that of the grand children is 6 years.  What is the average age of the family ?

A grocer has sale of Rs. 6435, Rs. 6927, Rs, 6855, Rs. 7230 and Rs. 6562 for 5 consecutive months.  How much sale must he have in the sixth month  so that he gets an average sale of Rs. 6500.

The captain of a cricket team of 11 members is 26 years old and the wicket keeper is 3 years older. If the ages of these two are excluded, the average age of the remaining players is one year less than the average age of the whole team. What is the average age of the team ?

The middle number among 13 consecutive natural numbers is 31. Find the sum of the 13 numbers ?

The average weight of 16 boys in a class is 50.25 kg and that of the remaining 8 boys is 45 .15 kg.  Find the average weight of  all the boys in the class.

The average monthly income of  P  and Q is Rs. 5050.  The  average monthly income of  A and R is Rs. 6250 and the average monthly income of  P  and R  is Rs. 5200.  The monthly income of  P is ______.

The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of b and C be 43 kg. Then the weight of B be.

The students in the Science club of Ezhimala G.U.P school conducted a survey on the consumption of electricity in 6 houses.  They found out that the average monthly consumption is 150 unites.  Then the houses started using CFL bulb.  In the survey after one month.  They found that there was a decrease of  180 units in  consumption.  What is the average consumption ?