There were 35 students in a hostel. If the number of the students is increased by 7, then the expenses of the mess incre…

The average of runs of a cricket player of 10 innings was 32. How many runs must he make in his next innings so as to in…

The average age of 30 boys in a class in 15 years. One boy, aged 20 years, left the class, but two new boys came in his …

The average monthly income of P and Q is Rs. 6000; that of Q and R is Rs. 5250; and that P and R is Rs. 5500. What is P&…

The mean of 20 items is 55. If two items 45 and 30 are removed, the new mean of the remaining items is :

The mean weight of 34 students of a school is 42 kg. If the weight of the teacher be included, the mean rises by 400 gra…

A car owner buys petrol at Rs. 17, Rs. 19 and Rs. 20 per litre for three consecutive years. Compute the average cost per…

A man has 'n' magical eggs whose average weight is 'k' gm. Each of the 'n' eggs produces 'n' eggs next day such that the…