A man had 7 children. When their average age was 12 years, a child aged 6 years died. Then average age of remaining six …

The arithmetic mean of 15 numbers is 41.4. Then the sum of these numbers is-

The average annual income (in Rs.) of certain agricultural workers is S and that of other workers is T. The number of ag…

A motorist travels to a place 150 km away at an average speed of 50 km/hr and returns at 30 km/ hr. His average speed fo…

Find the average of the following sets of scores:<br>385, 441, 876, 221, 536, 46, 291, 428

A man purchased 7 bags of rice at the rate of Rs. 800 each, 8 bags of rice at Rs. 1000 each and 5 bags of rice at the ra…

In Arun’s opinion, his weight is greater than 65 kg but less than 72 kg. His brother does not agree with Arun and …

There are 3 groups of students, each containing 25, 50 and 25 students respectively. The mean marks obtained by the firs…