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Calculate the number 1564

NUMBERMANIA: Calculate the number 1564 using numbers [8, 4, 5, 1, 91, 717] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 28

The first user who solved this task is Erkain Mahajanian.

#brainteasers #math #numbermania

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A Quiet Alarm

Johnny's mother sees the young boy tiptoeing down the hall with a bucket of water.

She asks, "Johnny, why are you tiptoeing around with a bucket of water?"
Johnny answers, "Dad asked me to quietly wake him at five."

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Baha ad-din Muhammad ibn Husayn al-Amili

Died 20 Aug 1622 at age 76 (born 20 Mar 1546).Syrian-Iranian theologian, mathematician and astronomer, a.k.a. Shaykh Baha'i). He became a very learned Muslim whose genius touched every field of knowledge from mathematics and philosophy to architecture and landscape design. He revived the study of mathematics in Iran. His treatise on the subject, Khulasat al-hisab (“The Essentials of Arithmetic”), and translations from the original Arabic was in use as a textbook until the end of the 19th century. His treatise in astronomy, Tashrihu'l-aflak ("Anatomy of the Heavens") summarised the works of earlier masters. He was born within a year of William Gilbert in England and Tycho Brahe in Denmark, and was still a child when his family left Syria to escape religious persecution.«

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