Aptitude - Average

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Question 1

In a group of 8 boys, 2 men aged at 21 and 23 were replaced, two new boys. Due to this the average cost of the group increased by 2 years. What is the average age of the 2 new boys?

Question 2

There are 459 students in a hostel. If the number of students increased by 36, the expenses of the mess increased by Rs .81 Per day while the average expenditure per head reduced by 1. Find the original expenditure of the mess?

Question 3

The average height of 30 girls out of a class of 40 girls is 160cms and that of remaining girls is 156cms. The average height of the whole class is:

Question 4

The average of numbers of 0.64204, 0.64203, 0.64202, 0.64201 is.

Question 5

The average of odd numbers upto 100 is

Question 6

Out of three numbers, the first number is twice the second and is half of the third. If the average of three numbers is 56, the three numbers in order are:

Question 7

The average age of three boys is 15 years. If their are ages are in the ratio 3:5:7, the age of youngest boy is:

Question 8

The average age of 30 students in a class is 12 years. The average age of a group of 5 students is 10 years and that of another group of 5 of them is 14 years. The average age of remaining students is:

Question 9

The average temperature of the first three days is 27 degree celsius and that of next three is 29 degree celsius. If the average of whole week is 28.5 degree celsius, the temperature of the last day of the week is :

Question 10

The average salary per head of all workers in a workshop is Rs. 850. If the average salary per head of 7 technicians is Rs. 1000 and the average salary per head of the rest is Rs. 780, the total number of workers in workshop is:

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