Quantitative Aptitude Average Questions 5

1. A motorist travels to a place 150 km away at an average speed of 50 km per hour and returns at 30 km per hour. His average speed for the whole journey in km per hour is :

2. The average age of 30 students is 9 years. If the age of their teacher is included, it becomes 10 years. The age of the teacher (in years) is :

3. The average age of 40 students of a class is 15 years. When 10 new students are admitted, the average is increased by 0.2 years. The average age of new students is :

4. The average salary per month of 30 employees in a company is Rs. 4000. If the manager’s salary is added, the average salary increases to Rs. 4300, waht is the salary of the manager ?

5. The average of 5 numbers is 7. When 3 new numbers are added, the average of the eight numbers is 8.5. The average of the three new numbers is :

6. The average weight of 29 students is 28 kg. By the admission of a new student, the average weight is reduced to 27.8 kg. The weight of the new student is :

7. The average weight of 8 men is increased by 1.5 kg when one of the men who weighs 65 kg is replaced by a new man. The weight of the new man is :

8. The average weight of 29 students of 50 balls is 2 lbs. If the weight of the container be included, the average weight will increase by 0.05 lbs. The weight of the container is :

9. The average age of 24 boys and the teacher is 15 years. When the teacher’s age is excluded, the average decreases by 1. What is the age of the teacher ?

10. The total of the present ages of P, Q, R and S is 96 years. To find out Q’s present age, which of the following informations given in statements A and B is/are sufficient ? A. The average age of P, Q and S is 20 years. B. The average age of R and S is 25 years.