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Trần Triệu Tân

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232. Adam Saville 7
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234. Trần Triệu Tân 7
235. Cường Nguyễn 7
236. Himanshu Shekhar 7
last 3 solved tasks
If b9bb7 - b9cbc = ca6 find number abc. Multiple solutions may exist.
In the following circles, the four outer numbers are used to calculate the number in the middle. Can you figure out the rule to determine what number should replace the question mark in the third circle?
How Many Squares Are There?

Ali Qushji

Died 16 Dec 1474Ali Qushji, Qushju-zada Abu al-Qasim 'Ala al-Din 'Ali b. Muhammad was a Turkish philosopher, theologian, mathematician, and astronomer who played a prominent intellectual role in the court of the Ulugh Beg in Samarqand (his birthplace) and was after the assassination of his patron invited to Istanbul by Ottoman Sultan Mehmed the Conqueror. Qushji traveled through Iran and Anatolia and eventually assumed a chair in the sciences at the college (madrasa) of Fatih, and later Aya Sofia. His main goal was to free sciences from Aristotelian physical and metaphysical principles. He also entertained the possibility of the Earth's rotation.

A little girl asked her father...

A little girl asked her father, "Daddy? Do all Fairy Tales begin with Once Upon A Time?"
He replied, "No, there is a whole series of Fairy Tales that begin with 'If Elected I promise...'"
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