The mean high temperature of the first four days of a week is 25°C whereas the mean of the last four days is 25.5&de…

There were 35 students in a hostel. Due to the admission of 7 new students the expenses of the mess were increased …

The average of 8 numbers is 20. The average of first two numbers is $$15\frac{1}{2}$$ and that of the next three is $$21…

If the average of m numbers is n<sup>2</sup> and that of n numbers is m<sup>2</sup> , then the …

In a certain factory there are five workers A, B, C, D and E. A can complete a work in 4 minutes, B in 5 minutes, C in 6…

The mean monthly salary paid to graduating MBA class of a management institute is Rs. 16000. The mean monthly salary pai…

The average of 80 boys in a class is 15. The average age of a group of 15 boys in the class is 16 and the average age of…

In Arun's opinion, his weight is greater than 65 kg but less than 72 kg. His brother doest not agree with Arun and he th…