A 3 min read

Introduction

In the high-stakes world of GMAT preparation, mastering Quantitative Reasoning is crucial. While many test-takers focus on memorizing formulas and practicing calculations, one of the crucial skills that gets missed is the ability to draw logical inference skills. Yes! This skill is not just for the Verbal section. It is equally important in Quant. By honing the ability to draw insightful inferences from given information, you can tackle complex problems with greater efficiency and accuracy.

Official Examples

Let’s examine two official GMAT questions to illustrate the power of logical inferences. Try to solve these questions on your own before moving forward.

Question 1:

Question 2:

Solutions

Let’s discuss both questions one by one.

At first glance, question 1problem might seem to require complex algebra. However, by making logical inferences, we can quickly narrow down the solution.

The key inference is that

• the bank statement shows a higher value,
  • meaning the recorded value (x.zy) is higher than the paid value (x.yz).
    • This leads us to the crucial insight: x.zy must be greater than x.yz.

Now, you can easily apply your conceptual understanding and solve:

This approach allows for a quick solution without the need for extensive calculations. It’s no surprise that this question has an accuracy rate of 55% and an average solving time of about 3 minutes, highlighting the challenge it poses to those relying solely on computational methods. Using inferences, you can solve this question within 1.5 – 2 mins.

Let’s now discuss the next question.

Solution 2:

This problem exemplifies how logical inferences can simplify seemingly complex equations. Just by looking at the expression given, we can infer that:

• y is a fraction
• The numerator is always non-negative since it is an absolute value.
• The denominator is always negative
  • y is always non-positive (less than or equal to 0)
  • So, we can say that the maximum value of y can be 0!

Do you think the question will be difficult to solve now?

You need to find the value of x for which y will be 0.

Thus, by using logical reasoning, we’ve avoided the need to test multiple values or solve complicated equations. This approach likely contributed to the question’s 57% accuracy rate and average solving time of almost 2.5 mins. Using inferences, you can solve this question within 1 -1.5 mins.

Advantages of drawing logical Inferences

Thus, the skill to draw logical inferences is useful in many ways.

• It’s a significant time-saver- By quickly identifying key information and making logical leaps, we can bypass lengthy calculations and arrive at solutions more rapidly.
• It improves accuracy by reducing the risk of computational mistakes.
• It enhances overall problem-solving skills, equipping us to tackle even the most challenging questions with confidence.

Conclusion

In conclusion, mastering logical inferences is a game-changer for GMAT Quant preparation. It can help solve problems more efficiently and accurately. As you continue your GMAT journey, remember that the ability to make insightful logical leaps is often the key to cracking even the most challenging Quant codes. You can now try your hand at a few more questions and see if you can draw the required inferences.