The quantitative reasoning section tests your logical skills as well as your knowledge of math concepts. To score high, you need to remember various formulas, theorems. Also you need to master critical problem-solving skills.
Today I am going to take you through one problem -solving skill – counting
Lets take this math problem
Observe the problem solving process…
Method 1: Conventional approach
2x + y = 12
x= (12 – y)/2
x= 6 – (y/2)
Y is an integer. So you need to list numbers which satisfy |y|<=12. The range of y values are from -12 to 12.
So lets list the pairs
The ordered pairs of (x, y)would be:
- (12, -12)
- (11, -10)
- (10, -8)
- (9, -6)
- (8, -4)
- (7, -2)
- (6, 0)
- (5, 2)
- (4, 4)
- (3, 6)
- (2, 8)
- (1, 10)
- (0, 12)
13 pairs.
Tip:
When listing numbers start from highest to lowest. or lowest to highest. Don’t substitute numbers randomly
Method 2: Visualization
2x + y = 12
y=12-2x
|y|<=12
Hence
|12-2x|<=12
-12 <=12-2x <=12
Dividing by 2
-6 <=6-x <=6
Lets break the inequality into 2 parts
-6 <=6-x ……………….. -12<=-x
6-x <=6……………….. -x<=0
Hence
-12<=-x<= 0
TIP :
When you are multiplying -1 to lesser than symbol.. change it to greater than symbol and vice versa
Or 12 >= x >=0
There are 13 possible values of x.
Hence there will 13 pairs
The second method takes less time
Feel free to contact me if you want to ace the math section by using simple strategies like this.
My contact link is here:
LinkedIn profile : https://www.linkedin.com/in/georgeanand/
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