If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55 and 60, then the average marks of all the students is: 

A company produces an average of 4000 items per month for the first 3 months. How much items, it must produce on an average per month over the next 9 months to get average of 4375 items per month over the whole year? 

Of the three numbers whose average is 60, the first is one-fourth of the sum of the whole number. The first number is: 

The average of eight successive numbers is 6.5. The average of the smallest and the greatest numbers among them will be: 

The average of the squares of first ten natural numbers is 

The average weight of 24 students is 35 kg. If the weight of teacher is added the average increased by 400 gram. What is the weight of the teacher?

5 number whose average is 76, the first is 3/7 times the sum of other 4. the first number is: 

The average monthly income of A and B is Rs.15,050 , and the average monthly income of B and C is Rs.15,350 and the average income of A and C is Rs.15,200. The monthly income of A is.