Aptitude Quiz - Average

1.     There are two sections A and B of a class, consisting of 36 and 44 students’ respectively. If the average weight of section A is 40kg and that of section B is 35kg, find the average weight of the whole class.

		A.	30.00 kg
		B.	35.00 kg
	✔	C.	37.25 kg
		D.	42.50 kg
2.     The distance between two stations A and B is 778 km. A train covers the journey from A to B at 84 km per hour and returns back to A with a uniform speed of 56 km per hour. Find the average speed of train during the whole journey.

	A.	60.3 km/hr
	B.	35.0 km/hr
	C.	57.5 km/hr
✔	D.	67.2 km/hr

3. The average weight of 15 girls in a group is 24 kg when a new girl included the average weight increases by 2. What is the weight of the new girl ?

a) 56 kg

 b) 28 kg

 c) 34 kg

d) none of these

Answer : a) 56 kg

4.     The average of four consecutive odd integers is 24 less than the sum of these integers. Then which will be the largest of them?
a) 27

b) 22

c) 24

d) 20

Answer : a) 27

5. The average age of a class of 32 students is 16 yrs. if the teacher's age is also included, the average increases by one year. Find the age of the teacher
A)49     

B)48      

C)47      

D)50

Answer : A

6. The average of seven numbers is 18. The average of first three numbers is 14 and the average of last three numbers is 19. What is the middle number?
A)42

     B)57      

     C)27      

     D) None of these

Answer : C

7. The average weight of a class of 20 boys was calculated to be 58.4 kgs and it was later found that one weight was misread as 56 kg instead of 65 kg. What is the correct weight?
A)67.4  

     B)57.7   

     C)58.85 

     D)49.4

Answer : C

8.  Six years ago the average of a family of 4 members was 26 years. A child has been born, due to Which the average age of the family is 24 years today. What is present age of the child? 

A)4 yrs 

     B)6yrs            

     C) 8yrs  

     D) 5yrs 

Answer : C

9. The average weight of 14 students in a class is increased by 3 kg. When a student who weights 48 kg is replaced by a new student. Find the weight of new student?
A) 85    

     B) 90     

     C) 45     

     D) 55

Answer : B

10.  If the average of seven numbers is 35. If one is included. The average become 40. The included number is: 

A) 70    

     B) 75     

     C) 80     

     D)60

Answer : B