The mean of 1<sup>2</sup>, 2<sup>2</sup>, 3<sup>2</sup>, 4<sup>2</sup>, …

Of the three numbers, the average of the first and the second is greater than the average of the second and the third by…

Out of 10 teachers of a school, one teacher retires and in place of him a new teacher 25 years old joins. As a result of…

The average of 4 positive integers is 59. The highest integer is 83 and the lowest integer is 29. The difference between…

The average of 12 numbers is 15 and the average of the first two is 14. What is the average of the rest ?

A car owner buys petrol at Rs.7.50, Rs. 8 and Rs. 8.50 per litre for three successive years. What approximately is the a…

A student obtained 60, 75 and 85 marks respectively in three monthly examinations in Physics and 95 marks in the final …

The average age of the mother and her six children is 12 years which is reduced by 5 years if the age of the mother is e…