Following the steps mentioned earlier, we see that statement A is not sufficient to answer the question as from statement A; we get 2 values of x as - 8 and + 8. Statement B is sufficient as we get x = 8.
Example 2: Is x odd?
A : 3x - 12 = 12
B. 2x + 16 = 24
Solution: If we follow the steps of solving a Data Sufficiency question, from statement A; we get the value of x as 8. This statement is sufficient to answer the question as we are getting a unique answer as "No".
Also from statement B; we get the value of x as 4. This statement is also sufficient to answer the question as we are getting a unique answer as "No".
Since, we are getting unique answers from both statements individually, so the answer is 4th option.
Example 3: What is the distance between Chandigarh and Delhi?
- Karnal is 130 km from Chandigarh.
- Delhi is 120 km from Karnal.
Just by looking at the statements, we can infer that a unique answer can be obtained by combining the two statements.
But, this answer is based on two assumptions:
Chandigarh, Karnal and Delhi are in a straight line and Karnal lies between Chandigarh and Delhi.
Even if it is given that these 3 cities are in straight line, still we have 2 possible answers to this question, even after combining the two statements i.e 250 km and 10 km.
Since, we are not getting any unique answer even after combining the two statements, so answer is 5th option.
Do remember these kinds of questions are traps to make you mark the wrong answer to the question.
- In this article, you learned the step by step approach to solve the Data Sufficiency questions. Do remember the process to solve a data sufficiency question and then solve it systematically.
- Besides learning this approach, you should solve variety of questions to get exposure to different kind of Data Sufficiency questions. This is a very important area and is frequently asked in almost every competitive exam.