The average of seven numbers is 18. If one of the numbers is 17 and if it is replaced by 31, then the average becomes :

The average weight of 15 students in a class increases by 1.5 kg when one of the students weighing 40 kg is replaced by …

Mukesh has twice as much money as Soham. Soham has 50% more money than Pankaj. If the average money with them is Rs. 110…

Of the three numbers, the first is twice the second and the second is twice the third. The average of the reciprocal of …

A man travels equal distances of his journey at 40, 30 and 15 km/h. respectively. Find his average speed for whole journ…

The average age of a class of 39 students is 15 years. If the age of the teacher is included, then the average increases…

A grocer has a sale of Rs. 6435, Rs. 6927, Rs. 6855, Rs. 7230 and Rs. 6562 for 5 consecutive months. How much sale must …

In a cricket eleven, the average age of eleven players is 28 years. Out of these, the average age of three groups of thr…