Hi there, every week for this month of September, I would want us to exercise our brain a little. The brain is like a piece of land and when is not intelligently cultivated, weeds would grown on it. So don’t let your brain be idle. What am I heading towards? For the next four weeks I would be posting an aptitude and logical test samples and would be glad if you join me, as we exercise our brain muscles by stretching it a little beyond its current level. Please make sure you try solving it before looking at the solution. Enjoy!
Logical Test for the week.
The difference between a two-digit number and the number obtained by interchanging the positions of its digits is 36. What is the difference between the two digits of that number? Solution
The difference between the two digits of that number is 4.
Explanation: In our elementary school mathematics,a two digit number would be in ones or unit, and then the next digit would be in tens. Let the tens’ digit be x and units’ digit be y. So we have a 10x and 1y, interchanging the position of the digits gives you a 10y and 1x. Remember the coefficient of the variables represents the Tens and Ones.
Then, (10x+y)-(10y+x) = 36
Expanding the Bracket; 10x + y – 10y- x = 36
Grouping like terms: (10x- x) + (y -10y)= 36
i.e. 9(x-y) = 36 and that results to x-y = 4.
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| CONGRATULATION ! |
What More!
Meet me next week as we try to exercise our brain by solving the logical and aptitude test for week 2.
Feel free to share this on facebook and other social networking sites. I would love to read your comments, so please tell me how you far. And let's keep on Exercising.
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