A question commonly asked by students is: “Sir, I am going for a Management Degree Course. In management entrance tests, why am I being tested on my Math skills?”
In this article, we will try to not only answer the above question, but also give you the right direction in terms of preparation for CAT and other Management entrance tests. We will also guide you to build the right approach (which is what matters finally) that will ensure that you crack the Quant section in the CAT or any Aptitude exams.
Before we do that, let us begin with the following question.
Simplify: (19)8 – 17(19)7 – 41(19)6 + 58(19)5 + (19)4 – 384(19)3 + 75(19)2 + 21(19) + 3.
A] 40 B] 41 C] 51 D] 61
Before jumping into solving this question, let’s understand why an Aptitude Test asks questions like these.
1. Is the objective to check your calculations?
A very simple answer to this is a clear “NO”, because you are sitting there for an aptitude test for a management course, or in short an MBA, and after completing your MBA you will become a manager. Of course, you are not expected to find the value of each term (in the above question) and then doing the addition and subtraction to find the answer. That would waste lot of your time and obviously that’s not the objective of the question.
Exam main sirf yeh question karna hai, yah baki paper bhi karna hai !
If you end up solving this question in this manner, you are proving that you are not an effective manager. Have you ever seen a manager doing calculations by hand or mentally? Understand that 10 times more difficult calculations than this can be done within fraction of seconds on a laptop. So, if as a future manager, you would not be required to do such calculations and think the things you don’t have to do in future, would CAT or any other aptitude test ever test you on that? NEVER! So that simply means CAT never tests your calculations or your calculation speed.
2. Is CAT testing your knowledge?
If CAT paper is testing your knowledge, then they should ask the following questions.
In the recent past, the inflation was in negative but still the prices of the commodities that we purchase on daily basis were rising. Can you explain the reason for this?
(relevant to a B.Com/Economics graduate)
What are the marketing tools one should use to advertise a newly launched product?
(relevant to a BBA student)
These questions would be much better questions to gauge your knowledge rather than questions on additions/subtractions.
But then these questions are not being asked to you which simply means that CAT does not want to select you on the basis of your knowledge.
Now a big question is: What does any Aptitude Test actually want to check by giving such questions (as the one at the beginning of this article). To answer this, let’s understand a few things.
After you pass out of a B-school, you will take on the role of a manager in an organization. Therefore, a good Aptitude Test is designed to check whether a candidate has the caliber to become a manager or not. How do they check it and what qualities they look for? Let us understand that.
3. When you become a manager, you will face a lot of complicated situations. An effective manager is one who simplifies those situations and not the one who complicates them further?
Take any 2 multiples of 6 for e.g. 12 and 18
12 + 18 = 30; 18 – 12 = 6
6 and 30 both are multiples of 6.
That means if I have two multiples of 6 i.e. 6a and 6b and if I add or subtract any of them
6a + 6b = 6(a + b), the answer would always be a multiple of 6.
To understand this, no hardcore knowledge is required. The same logic can also be applied to the question given at the beginning. Numbers from (19)8 to 21(19) are all multiples of 19. Hence result of their addition/subtraction would also always be a multiple of 19. That is,
(19)8 – 17(19)7 – 41(19)6 + 58(19)5 + (19)4 – 384(19)3 + 75(19)2 + 21(19) + 3 = 19n + 3
A question which looked very complicated initially now seems quite simple. The way you look at a problem determines the process to be applied to solve that problem. The only thing required is to start looking at things from a different perspective/angle. Don’t just take a “quant” question as a “mathematics” question (remember that you are not being tested to be Maths professor). Take it as a situation that you need to simplify. Why most of the times the question looks complicated is because the examiner wants to test whether you get scared in a difficult/complicated situation or whether you have the capability to see things differently and make them simpler. Of course, a manager is paid so well not because of hard work, but because of smart work.
One important thing that why these situations are in the form of mathematics questions. The answer is: Whether a person is a vegetable supplier or a CEO of a big company, all have studied the basic mathematics in their life. So quant becomes an obvious choice which could test everyone on the same platform.
Having understood that a manager is supposed to simplify the matters and not complicate them, let us understand the other quality associated with an effective manager: Optimal utilization of all the resources. This would bring in more efficiency in the system.
So an aptitude test also wants to test whether you implement what you say, or do you just say it for the sake of it. When the question was given to you, what are the resources you were equipped with?
Simplify: (19)8 – 17(19)7 – 41(19)6 + 58(19)5 + (19)4 – 384(19)3 + 75(19)2 + 21(19) + 3.
A] 40 B] 41 C] 51 D] 61
The first resource was the information from question which you used and simplified the situation. The second resource was options. Options were also given to you with the question. So CAT wants to test whether you can use your hidden resources and get the work done, or not?
To finally answer the question, let me tell you that once you reach the stage that the expression is of 19n + 3 type, you can use options (read, resources) and realize that 41 is the only option which is of 19n + 3 type. So, the correct answer is 41. You can now realize what it takes to act like an effective manager. You need to train your mind by exposing yourself to such difficult situations time and again, till “being an effective manager” becomes your habit.
4. Another objective of an aptitude test is to check whether you can get maximum output with minimum resource, or can you work under constraints. A manager most of the times has to face a situation where there would be lack of some or the other resource. So a good manger is one who can give the maximum output in those constraint/minimum resources. Now when we talk of the aptitude test, this quality is also tested. You know that if you had unlimited time, you would have solved all the questions in the aptitude test with 100% accuracy. The above mentioned question can also be done by simply calculating if unlimited time was there. But what an Aptitude Test does is to give you restricted time limit and check whether you can give the maximum output in constraint resource. The output are the marks out here and you could only maximize the output not by calculating the values, but solving the questions with the RIGHT APPROACH and that is
When you start an aptitude test, don’t just start calculating. First analyze the situation (question), simplify if by looking at things from a different perspective, solve by using all the resources (including options) optimally and then only you can get the maximum possible output (marks) in the minimum possible resources (time). This can be termed as the TWI Approach i.e. Think Without Ink. This will also help you to improve the decision making skills.
- NIKHIL CHAWLA
Nikhil is an alumnus of NMIMS, Mumbai – one of the top 10 B-Schools in India. A passionate mentor and coach, his energy during interactions with students is to be seen to be believed. Nikhil’s QA sessions are as much of a hit as his motivational sessions which fill the students with tremendous self-belief and positivity.