Introduction
Logic and Inference involve drawing conclusions based on given premises or conditions. This topic covers Age, Comparison, and Coding-Decoding (Change in Name) to test analytical thinking.
Explanation Step by Step
To solve logic problems, represent the data visually. For comparisons, use inequality signs. For "Change in Name" questions, identify the substitute word for the original object.
Sub-topics
Age, Comparison, Change in Name
This sub-topic deals with ranking people based on height, age, or specific attributes.
Examples
Example 1
Tricks and Shortcuts
Always start by placing the person who has the most defined relationship with others. Use symbols like > and < for quick visualization.
Common Mistakes
Ignoring the word 'not'. For example, 'A is not taller than B' means A is shorter than or equal to B.
Practice Questions
Easy Questions
- A is taller than B, and B is taller than C. Who is the tallest?
- If 'Red' is called 'Blue' and 'Blue' is called 'Green', what is the color of the clear sky?
- Rahul is older than Rohit. Rohit is older than Vikas. Who is the youngest?
Medium Questions
- Among 4 friends, Karan is heavier than Arjun but lighter than Bhim. Arjun is heavier than Nakul. Who is the heaviest?
- A's age is twice of B. B is 5 years older than C. If C is 10, what is A's age?
- In a race, Tom finished before Jerry but after Spike. Jerry finished before Tyke. Who won the race?
Hard Questions
- Five people are sitting in a row. X is to the left of Y. Z is to the right of Y. W is between X and Y. Who is at the extreme left?
- If 'Dog' is 'Cat', 'Cat' is 'Lion', and 'Lion' is 'Tiger', which animal is known as the king of the jungle?
- Six years ago, mother's age was 3 times her son's age. If the son is 16 now, what is the mother's current age?
Revision Summary
Focus on systematic arrangement and symbol usage to solve Logic and Inference questions accurately.