List of top Quantitative Aptitude Questions on Averages asked in NIFT

The average of the following numbers 132, 148, 156, 126, 112, 136, is:
There are two sections A and B of a class, consisting of 36 and 44 students, respectively. If the average weight of students of section A is 44 kg and those of section B is 39 kg, then the average weight of students of both the sections (in kg) is:
The average age of 6 sons of a family is 8 years. The average age of the sons together with their parents is 22 years. If the father is 8 years older than the mother, then the age of the father (in years) is:
Out of four numbers whose average is 75, the first number is one-fourth of the sum of the last three numbers. The first number is:
In a class of 35 students, the average weight of 21 students is 46 kg and the average weight of the remaining students is 41 kg. The average weight of all the students and a teacher is 44.75 kg. What is the weight of the teacher (in kg)?