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Russian Math forms the traditional basis for all other maths (except Greek & Arabic), but including Chinese, Indian, Singapore, and European. Russian Math saw the peak of its influence during the Soviet Period in the 50’s, 60’s and 70’s, when math students all over the world used Russian Textbooks as well as Russian methods of…

Albert and Bernard just met Cheryl and wanted to know when her birthday was. Cheryl gave them a list of ten possible dates: May 15, May 16, May 19, June 17, June 18, July 14, July 16, August 14, August 15, August 17. Then Cheryl informed Albert what month she was born, and Bernard –…

A boy from Boonevale needs to send a chest with valuables to his friend in Whatchyopocketville. However, the Post steals everything, if it’s not locked down. So, he hangs a lock on the chest at Boonevale. Question: How can he send this chest so that the valuables are not stolen by the Post, but his…

Two bear cubs found a large round head of cheese in the woods. They wanted to divide it equally but could not manage to do so. Each was afraid that the other would get more. All of a sudden out of nowhere, a sneaky fox approached them. "Let me help you share your cheese equally."…

Dunno (Neznaika) and his friend, Doughnut (Pon’chik), each have coins in the denominations of 1, 3, 5, and 7 Farthings. They both have the same amount of money. At the same time, – Dunno has as many 1-Farthing coins as Doughnut has 3-Farthing coins. – Dunno has as many 3-Farthing coins as Doughnut has 5-Farthing…

Mom baked pies – three with rice, three with beans and one with cherries – and laid them on a dish in a circle. Then she put the dish in the microwave to warm. All the pies look exactly alike. Masha knows how they were arranged, but does not know how the dish spun around…

There were three villages: Truthville (always tell the truth), Pants-on-fire-ville (always lying) and Wishwashy (lying every other sentence). Villages were equally spaced from each other and citizens of one could not see the other. There was a fire station in the middle, which was also not visible from each of the villages. A call comes…