Arithmetic Aptitude 3

Question 1
Present age of Vinod and Ashok are in ratio of 3:4 respectively. After 5 years, the ratio of their ages becomes 7:9 respectively. What is Ashok’s present age is ?
Tick
40 years
Cross
28 years
Cross
32 years
Cross
36 years


Question 1-Explanation: 
Let the present age of Vinod and Ashok be 3x years and 4x years respectively.
Then (3x+5) / (4x+5)  = 7 / 9 

∴ 9(3x + 5) = 7(4x + 5)
∴ 27x + 45 = 28x + 35
∴ x = 10
∴ Ashok’s present age = 4x = 40 years 
Question 2
At present, the ratio between ages of Ram and Shyam is 6:5 respectively. After 7 years, Shyam’s age will be 32 years. What is the present age of Ram?
Cross
32
Cross
40
Tick
30
Cross
36


Question 2-Explanation: 
Let the present age of Ram and Shyam be 6x years and 5x years respectively.

Then 5x + 7 = 32
∴      5x = 25
∴        x = 5
∴ Present age of Ram = 6x = 30 years
Question 3
The present ages of A, B and C are in proportions 4:5:9. Nine years ago, sum of their ages was 45 years. Find their present ages in years
Cross
15,20,35
Cross
20,24,36
Cross
20,25,45
Tick
16,20,36


Question 3-Explanation: 
Let the current ages of A, B and C be ax years, 5x years and 9x respectively.
Then (4x-9) + (5x-9) + (9x-9) =45
∴ 18x – 27 = 45
∴ 18x = 72
∴ x = 4
Present ages of A, B and C are 4x = 16, 5x = 20, 9x = 36 respectively.
Question 4
A person’s present age is one third of the age of his mother. After 12 years, his age will be one half of the age of his mother. What is present age of his mother?
Cross
30
Cross
34
Cross
38
Tick
36


Question 4-Explanation: 
Le the present ages of son and his mother are x years and 3x years.
Then (3x + 12) = 2( x + 12)
∴ 3x + 12 = 2x + 24
∴ x = 12
∴ Present age of mother = 3x = 36 years 
Question 5
A is as older than B as he is younger than C.If the sum of ages of B and C is 68 years. What is the present age of A?
Cross
24 years
Tick
34 years
Cross
28 years
Cross
32 years


Question 5-Explanation: 
A – B = C – A
∴ 2A = B + C
And also given that B + C = 68
∴ 2A = 68
∴   A = 34 
Question 6
Opportunistic reasoning is addressed by which of the following knowledge representation
Cross
Script
Tick
Blackboard
Cross
Production Rules
Cross
Fuzzy Logic


Question 6-Explanation: 
Opportunistic reasoning is a method of selecting suitable logical inference strategy from the knowledge base of the AI system. Blackboard is an AI model of opportunistic reasoning where a common knowledge base is updated frequently by diverse knowledge sources. So, (B) is the correct option.
There are 6 questions to complete.

  • Last Updated : 06 Oct, 2015

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