Learn Programming through Logical Thinking Series -1

This blog explains about Learn Programming through Logical Thinking Series -1 and is explained below :

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In our Learn Logical Thinking and Programming Series -1, we are going to discuss about the below aptitude. This is one of the easiest logical thinking questions, usually asked in Aptitude rounds during interviews.

Aptitude:

1. The sum of age of 5 children born at interval of 3 years each is 50 years. Find out Who is the youngest child?

Solution:

Let us assume that, 1st child will be x, 2nd child will be x+3, 3rd child will be x+6, 4th child will be x+9 and

5th child will be x+12.

The given Clue is -Sum of ages of 5 children = 50

Thus, we can say that x+x+3+x+6+x+9+x+12 = 50

i.e.., 5x+30 = 50

x = (50 – 30)/5, which is 4.

2. The average age of A , B & C is 27 years . After joining D their average age become 28 then what will be the age of D .

SOLUTION :

The average age of A , B & C = 27 years .

Then the sum of their ages = A +B + C = 27 * 3

= 81 years .

So the average age of A , B , C & D will be 81 + D = 28 * 4

= 112 years

=> D = 112 – 81 = 31 years .

Thus the age of D = 31 years .

Now We will find this can be found using Java Program below.

Learn Logical Thinking through Programming:

public class YoungestChild {

public static void main(String[] args) {

int noOfchildren=5;

int age=50;

int interval=3;

int min=0;

for(int i=0;i<noOfchildren;i++)

{

min=min+(interval*i);

}

min=(age-min)/noOfchildren;

System.out.println(“Youngest age:”+ min);

}

OUTPUT:

Youngest age: 4

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