1. The current average age of a family of four members A, B, C and D is 15 years. Find the average age (in years) of the family after 5 years.
A. 25
B. 20
C. 15
D. 19
Correct Answer : B
2. The average marks scored by Mahesh in five out of six subjects in an exam is 60. If Mahesh scored an average of 75 marks in the six subjects, find his score in the sixth subject.
A. 100
B. 125
C. 150
D. 90
Correct Answer : C
3. In an office, the average salary of the male employees as well as the average salary of the female employees is 15000 per month. Find the average salary per month of all the employees.
A. 14000
B. 15000
C. 16000
D. Cannot be determined
Correct Answer : B
4. The average marks scored by the girls in a class of 45 students in an exam is 90. If the number of boys in the class and their average marks in the same examination are 15 and 60 respectively, what is the average marks of all the students in the class?
A. 85
B. 80
C. 75
D. Cannot be determined
Correct Answer : B
5. The average age of girls in a class of 42 students is 13 years. The average age of all the boys as well as the average age of 23 of the boys of the same class is 16 years. Which of the following could be the average age of the total students in the class?
A. 13.5
B. 14
C. 14.5
D. 15
Correct Answer : D
6. In an office, the average height of female employees is 150 cm and the average height of male employees is 160 cm. If there are 300 employees in the office, find the average height (in cm) of all the employees.
A. 150
B. 160
C. 155
D. Cannot be determined
Correct Answer : D
7. The average weights of the boys and the girls in a class are 30 kg and 40 kg respectively. Find the average weight of all the students in the class (in kg).
A. 30
B. 35
C. 40
D. Cannot be determined
Correct Answer : D
8. The average age of a class of 20 students is 20 years. If, a new student, whose age is 20 years, joins the class, find the new average age of the class (in years).
A. 20
B. 21
C. 22
D. 23
Correct Answer : A
9. A bag contains 3 kg of potatoes and 5 kg of tomatoes. If the cost of potatoes is 6 per kg and the cost of tomatoes is 8 per kg, find the average price per kilogram of the vegetables in the bag.
A. 7
B. 7.25
C. 7.5
D. 7.75
Correct Answer : B
10. The average number of sweets with six children is six. If another child joined them the average number of sweets with the seven children will become 7. Find the number of sweets with the seventh child.
A. 11
B. 12
C. 13
D. 14
Correct Answer : C
11. Find the average of the numbers 41,45, 49, 53, 57, 61,65, 69 and 73.
A. 53
B. 55.5
C. 57
D. 58.5
Correct Answer : C
12. The ratio of the number of boys to the number of girls in a class is 3 : 5. If the average weights of the boys and the girls in the class are 20 kg and 16 kg respectively, find the average weight of the total students in the class (in kg).
A. 17
B. 18
C. 17.5
D. Cannot be determined
Correct Answer : C
13. A milkman has 20 litres of pure milk. Find the quantity (in litres) of water to be added to it so that he gets 50% profit by selling it at its cost price.
A. 5
B. 10
C. 15
D. 20
Correct Answer : B
14. A vessel contains 70 litres of a mixture of milk and water containing 90% milk. Find the quantity (in litres) of water to be added to the vessel so that the percentage of milk in the new solution is 87.5%
A. 1
B. 2
C. 3
D. 4
Correct Answer : B
15. A vessel contains 25 litres of a mixture of milk and water containing 40% milk. Find the quantity (in litres) of pure milk to be added to the vessel so that the ratio of milk and water in the vessel becomes 1:1.
A. 2.5
B. 5
C. 7.5
D. 10
Correct Answer : B
16. A vessel contains 20 litres of a mixture of milk and water containing 60% milk. 5 litres of pure milk is added to it. Find the percentage of milk in the new mixture.
A. 50% milk
B. 52% milk
C. 62% milk
D. 68% milk
Correct Answer : D
17. A total of 57 sweets were distributed among 10 children such that each girl gets 5 sweets and each boy gets 6 sweets. Find the number of girls.
A. 6
B. 5
C. 4
D. 3
Correct Answer : D
18. A vessel contains 10 litres of pure milk. 1 litre of milk is taken out and replaced by an equal amount of water. 1 litre of mixture is then taken out and replaced by an equal amount of water, find the final quantity of milk (in litres).
A. 9
B. 8.1
C. 7.29
D. None of these
Correct Answer : B
19. A vessel contains 10 litres of pure milk. 1 litre of milk is taken out and replaced by an equal amount of water. 1 litre of mixture is then taken out and replaced by an equal amount of water. Find the ratio of milk and water in the final mixture.
A. 81:100
B. 3.3881944444
C. 0.8479166667
D. 0.8611111111
Correct Answer : B
20. Two solutions of sulphuric acid are mixed in the ratio of 3 : 7. The first Solution contains 20% sulphuric acid and the second solution contains 30% sulphuric acid. Find the concentration(percentage) of sulphuric acid in the final mixture.
A. 0.25
B. 0.26
C. 0.27
D. 0.28
Correct Answer : C
21. Find the average of (5 + 5 + …. upto 100 times) and (8 + 8 + …. upto 200 times).
A. 6
B. 7
C. 6.5
D. 7.5
Correct Answer : B
22. 6 kg of sugar costing 10 per kg is added to 9 kg of sugar costing 15 per kg. At what price should this mixture be sold so that there is no loss or gain?
A. 11
B. 12
C. 13
D. 14
Correct Answer : C
23. The average monthly income of a man for the first 4 months, next 4 months and the last 4 months of a year are 4000, 5600 and 6420 respectively. Find his average monthly income for the year.
A. 5310
B. 5320
C. 5340
D. 5380
Correct Answer : C
24. The average monthly income per person in a family of 5 members is 9000. In a certain month, each member got 900 less than usual. Find the average monthly income per person in that month.
A. 6300
B. 7200
C. 8100
D. 5400
Correct Answer : C
25. The average monthly income of a man for the first 9 months of a year is 12000. His average monthly income for the last 3 months of that year is 16000. His average monthly income for that year is
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