Average Worksheet-6

Average Worksheet-6

1. 10 years ago, the average age of a family of 4 members was 24 years. Two children having been born (with age difference of 2 years), the present average age of the family is the same. The present age of the youngest child is:

(a) 1 year            (b) 2 years         (c) 3 years         (d) 5 years

2. After replacing an old member by a new member, it was found that the average age of five members of a club is the same as it was 3 years ago. What is the difference between the ages of the replaced and the new member?

(a) 2 years         (b) 4 years         (c) 8 years         (d) 15 years

3. The average age of 3 children in a family is 20% of the average age of the father and the eldest child. The total age of the mother and the youngest child is 39 years. If the father's age is 26 years, what is the age of second child?

(a) 15 years                                    (b) 18 years

(c) 20 years                                    (d) Cannot be determined

4. The average age of a group of persons going for picnic is 16 years. Twenty new persons with an average age of 15 years join the group on the spot due to which their average age becomes 15.5 years. The number of persons initially going for picnic is:

(a) 5                    (b) 10                  (c) 20                  (d) 30

5. A certain factory employed 600 men and 400 women and the average wage was Rs. 25.50 per day. If a woman got Rs. 5 less than a man, then what are their daily wages?

(a) Man : Rs. 25, Woman : Rs. 20

(b) Man : Rs. 27.50, Woman : Rs. 22.50

(c) Man : Rs. 30, Woman : Rs. 25

(d) Man : Rs. 32.50, Woman : Rs. 27.50

6. The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean score of 80 and the dullest 25% a mean score of 31. The mean score of remaining 55% is:

(a) 45                                               (b) 50

(c) 51.4 approx                              (d) 54.6 approx

7. The average salary of all the workers in a workshop is Rs. 8000. The average salary of 7 technicians is Rs. 12000 and the average salary of the rest is Rs. 6000. The total number of workers in the workshop is:

(a) 20                 (b) 21                  (c) 22                  (d) 23

8. In a school with 600 students, the average age of the boys is 12 years and that of the girls is 11 years. If the average age of the school is 11 years 9 months, then the number of girls in the school is:

(a) 150                (b) 250               (c) 350               (d) 450

9. In an examination, a pupil's average marks were 63 per paper. If he had obtained 20 more marks for his Geography paper and 2 more marks for his History paper, his average per paper would have been 65. How many papers were there in the examination?

(a) 8                    (b) 9                    (c) 10                  (d) 11

(e) 12

10. The average age of students of a class is 15.8 years. The average age of boys in the class is 16.4 years and that of the girls is 15.4 years. The ratio of the number of boys to the number of girls in the class is:

(a) 1 : 2               (b) 2 : 3              (c) 3 : 4              (d) 3 : 5

Answer Key:

(1)-c; (2)-d; (3)-d; (4)-c; (5)-b; (6)-c; (7)-b; (8)-a; (9)-d; (10)-b