## How to solve a hard number system question for CAT confidently and quickly 8

Number system puzzle problem 8: Leftmost digit of a natural number at least 7 digits long is 3. When it is dropped, number becomes one-fifth...Read on.

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**Book launch:** **Innovative Problem Solving of Puzzles**

Basic concepts on maths, mostly up to class 10. This is the most important math knowledge used in almost all competitive exams.

Submitted by Atanu Chaudhuri on Fri, 08/01/2021 - 22:55

Submitted by Atanu Chaudhuri on Wed, 06/01/2021 - 22:12

Number system puzzle problem 7: Cube of a number exceeds its product with two other numbers by 2, the cube of the second number is less than...Read on.

Submitted by Atanu Chaudhuri on Tue, 05/01/2021 - 20:50

Solve Number system puzzle problem 6 in 1 min: Product of a 2 digit number and number formed by reversing digits of the first is 2430. Find smaller number.

Submitted by Atanu Chaudhuri on Mon, 04/01/2021 - 12:24

Number System Puzzle Problem 5: If 495 is subtracted from a 3 digit number with its digits reversed, you get the original number. Sum of digits...Read on.

Submitted by Atanu Chaudhuri on Sun, 03/01/2021 - 22:14

Learn how to solve number system puzzle problem 4 in 1 min: The sum of thousands and tens digits in a 4 digit number is 4, the sum of hundreds...Read on.

Submitted by Atanu Chaudhuri on Sun, 03/01/2021 - 16:15

Solve Number System Puzzle Problem 3 in 2 mins: Denominator of a fraction is less than the square of the numerator by 1. If 2 is added to both...Read on.

Submitted by Atanu Chaudhuri on Fri, 01/01/2021 - 18:12

Solve number system puzzle problem 2 in 90 secs: What 2 digit number is less than sum of squares of its digits by 11 and exceeds their doubled product by 5?

Submitted by Atanu Chaudhuri on Thu, 17/12/2020 - 23:30

Surely you can solve the 3 digit number puzzle in 20 mins if you approach the puzzle with systematic problem solving techniques.

Submitted by Atanu Chaudhuri on Thu, 19/11/2020 - 22:23

The difference of ages of two children and the sum of the squares of their ages are given. The mother's age can be formed by placing squares of the ages of the two children one after the other forming a 4-digit number. Such a problem hides key patterns that, if discovered, give you the solution immediately...

Submitted by Atanu Chaudhuri on Tue, 10/11/2020 - 23:41

Solve Number System Puzzle Problem 1 in 180 secs: How many of the four digit natural numbers divisible by 24 have also 24 appearing in them? Can you solve?