BRAIN TEASERS

Calculate the number 4380

NUMBERMANIA: Calculate the number 4380 using numbers [9, 6, 1, 4, 39, 746] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
The first user who solved this task is Djordje Timotijevic.
#brainteasers #math #numbermania

Passing An Exam

Three patients in a mental institution prepare for an examination given by the head psychiatrist. If the patients pass the exam, they will be free to leave the hospital. However, if they fail, the institution will detain them for five years.
The doctor takes the three patients to the top of a diving board looking over an empty swimming pool, and asks the first patient to jump.
The first patient jumps head first into the pool and breaks both arms.
Then the second patient jumps and breaks both legs.
The third patient looks over the side and refuses to jump. "Congratulations! You're a free man. Just tell me why didn't you jump?" asked the doctor.
To which the third patient answered, "Well Doc, I can't swim!"
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Isaac Merrit Singer

Died 23 Jul 1875 at age 63 (born 27 Oct 1811).American inventor of a practical sewing machine. While an actor, he invented an excavator (1839) and a wood carver (1849) before he turned itinerant mechanic and improved the sewing machine. His first sewing machine patent, issued 12 Aug 1851 (U.S. No. 8294), had a rocking treadle design, continuous feed, and a straight, vertical needle like modern machines. He settled with Elias Howe for infringement of his prior (1846) sewing machine patent. The company Singer then founded (1856) was, within the decade, the world's largest sewing machine manufacturer. His biggest invention was a new way of marketing to consumers. He spent lavishly on advertising, pioneered affordable purchase by installment credit, and provided after-sale service. In 1863, he retired, with 12 more patents on his machines.«
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