Basic concepts on maths, mostly up to class 10. This is the most important math knowledge used in almost all competitive exams.
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.
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.
Solve hard CAT Number system problem 6: Product of a 2 digit number and number formed by reversing digits of the first is 2430. Find smaller number.
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.
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.
Solve Hard CAT Number System 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.
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?
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?
Secant of a circle relation: Square of a tangent segment from an external point equals product of two segments of a secant of a circle through the point.
Incenter of a triangle and Angle bisectors: Segmentation of the opposite side by an angle bisector and Segmentation of the angle bisectors at the Incenter.
