Quantitative Aptitude

General Questions

Quantitative Aptitude Exercise Mode

General Questions

Practice and master this topic with our carefully crafted questions.

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Question 21
Three years ago, the average age of A and B was 18 years. With C joining them, the average age become 22 years. How old is C now ?

A
24 years
B
27 years
C
28 years
D
30 years
Correct Answer: Option A

Present age of (A + B)
= (18 x 2 + 3 x 2) years
= 42 years.

Present age of (A + B + C)
= (22 x 3) years = 66 years.

C's age = (66 - 42) years = 24 years.

Question 22
The average age of husband, wife and their child 3 years ago was 27 years and that of wife and the child 5 years ago was 20 years. The present age of the husband is :

A
35 years
B
40 years
C
50 years
D
None of these
Correct Answer: Option B

Sum of the present ages of husband, wife and child
  = (27 x 3 + 3 x 3) years = 90 years.

Sum of the present ages of wife and child
 = (20 x 2 + 5 x 2) years = 50 years.

Husband's present age = (90 - 50) years = 40 years.

Question 23
3 years ago, the average age of a family of 5 members was 17 years. A baby having been born, the average age of the family is the same today. The present age of the baby is :

A
1 year
B
1 year 6 months
C
2 years
D
3 years
Correct Answer: Option C

Total age of 5 members, 3 years ago
          = (17 x 5) years = 85 years.

Total age of 5 members now = (85 + 3 x 5) years
                                          = 100 years

Total age of 6 members now = (17 x 6) years
                                          = 102 years.

 Age of the baby = (102 - 100) years = 2 years.

Question 24
The average of 11 numbers is 10.9. If the average of the first six number is 10.5 and that of the last six numbers is 11.4, then the middle number is :

A
11
B
11.3
C
11.4
D
11.5
Correct Answer: Option D

Middle number
=[(10.5 x 6 + 11.4 x 6) - 10.9 x 11]
= (131.4 - 119.9)
= 11.5

Question 25
The average weight of three boys A, B and C is 163/3 kg, while the average weight of three boys B, D and E is 53 kg. What is the average weight of A, B, C, D and E ?

A
52.4 kg
B
53.2 kg
C
53.8 kg
D
Data inadequate
E
None of these
Correct Answer: Option D

Total weight of (A + B + C) = (163/3 x 3) kg
= 163 kg.

Total weight of (B + D + E) = (53 x 3) kg
= 159 kg.

Adding both, we get : A + 2B + C + D + E
= (163 + 159) kg = 322 kg.

So, to find the average weight of A, B, C, D and E, we ought to know B's weight, which is not given.

So, the data is inadequate.

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