by Gaurav Tiwari | Oct 11, 2011 | Featured, Fun Stuff, Math, Problems, Puzzles

This is a famous problem of intermediate analysis, also known as ‘Archimedes’ Cattle Problem Puzzle’, sent by Archimedes to Eratosthenes as a challenge to Alexandrian scholars. In it one is required to find the number of bulls and cows of each of...
by Gaurav Tiwari | Oct 7, 2011 | Fun Stuff, Humor, Logic, Math, Problems, Puzzles, Recreations

This is not just math, but a very good test for linguistic reasoning. If you are serious about this test and think that you’ve a sharp [at least average] brain then read the statement (only) below –summarize it –find the conclusion and then answer...
by Gaurav Tiwari | Oct 1, 2011 | Fun Stuff, Math, Problems, Puzzles, Study Notes

This is a popular Chinese problem, on Linear Diophantine equations, which in wording seems as a puzzle or riddle. However, when used algebraic notations, it looks obvious. The problems states : If a cock is worth 5 coins, a hen 3 coins, and three chickens together 1...
by Gaurav Tiwari | Sep 25, 2011 | Featured, Fun Stuff, Math, Problems, Puzzles, Recreations

Two close friends, Robert and Thomas, met again after a gap of several years. Robert Said: I am now married and have three children. Thomas Said: That’s great! How old they are? Robert: Thomas! Guess it yourself with some clues provided by me. The product of the...
by Gaurav Tiwari | Aug 31, 2011 | Education, Featured, Math, Number Theory, Problems, Recreations, Research, Study Notes

Before my college days I used to multiply this way. But as time passed, I learned new things. In a Hindi magazine named “Bhaskar Lakshya”, I read an article in which a columnist ( I can’t remember his name) suggested how to multiply in single line...
by Gaurav Tiwari | Aug 25, 2011 | Math, Number Theory, Problems, Real Analysis, Recreations, Research, Study Notes

Multiplication is probably the most important elementary operation in mathematics; even more important than usual addition. Every math-guy has its own style of multiplying numbers. But have you ever tried multiplicating by this way? Exercise: $ 88 \times 45$ =? Ans:...