Editorial Board Solutions for Chapter: Arithmetic Maths, Exercise 1: AVERAGE

In a hostel there were $100$ students. To accommodate $20$ more students the average expenditure is decreased by $Rs. 5$, but total expenditure increased by $Rs. 400$. Find the total expenditure of the hostel now?

Visitors to a show were charged $Rs. 15$ each on the first day, $Rs. 7.50$ on the second day, $Rs. 2.50$ on the third day and total attendance on the three days were in ratio $2:5:13$ respectively. The average charge per person for the whole show is:

A building contractor employes $20$ male, $15$ female and $5$ child workers. To a male worker, he pays Rs. $25$ per day, to a female worker Rs.$20$ per day and to a child worker Rs.$8$ per day. The average wage per day paid by the contractor (in Rs.) is:

A man purchased $3$ blankets at the rate $Rs. 100$ each, $5$ blankets at $Rs. 150$ each and two blankets at a certain rate which is now slipped off from his memory, but he remembers that the average price of the blankets was $Rs. 150$. Find the unknown rate of two blankets.

The average temperature for Monday, Tuesday, Wednesday and Thursday was $48$ degree and for Tuesday, Wednesday, Thursday and Friday was $46$ degee, if the temperature on Monday was $42$ degree, find the temperature on Friday.

The average age $9$ members of a committee are the same as it was $2$ years ago because an old member has been replaced by a younger member. Find how much younger is the new member than the old member.

$9$ men went to a hotel, $8$ of them spent $Rs. 3$ each over their meals and the $9th$ spent $Rs. 2$ more than the average expenditure of all the nine, determine the total money spent by them.

The average marks in mathematics scored by the pupils of a school at the public examination were $39$. If four of these pupils who actually scored $5,12,15$ and $19$ marks at the examination had not been sent up, the average marks for the school would have been $44$. Find the number of pupils sent up for examination from the school.