BRAIN TEASERS

# Calculate the number 3800

NUMBERMANIA: Calculate the number 3800 using numbers [7, 4, 1, 3, 91, 889] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
The first user who solved this task is Nílton Corrêa de Sousa.
#brainteasers #math #numbermania

### The loan

Before going to Europe on business, a man drove his Rolls-Royce to a downtown New York City bank and went in to ask for an immediate loan of \$5,000.

The bank officer says the bank will need some kind of security for such a loan. So the businessman hands over the keys to a Rolls-Royce parked on the street in front of the bank. Everything checks out, and the bank agrees to accept the car as collateral for the loan. An employee drives the Rolls into the bank's underground garage and parks it there.

Two weeks later, the businessman returns, repays the \$5,000 and the interest, which comes to \$15.40. The loan officer says, "We are very happy to have had your business, and this transaction has worked out very nicely, but we are a little puzzled. While you were away, we checked you out and found that you are a multimillionaire. What puzzles us is: why would you bother to borrow \$5,000?"

The man smiled. "Where else could I park my Rolls-Royce in Manhattan for two weeks and pay only \$15.40?"

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### Hugo von Mohl

Born 8 Apr 1805; died 1 Apr 1872 at age 66. German botanist noted for his research on the anatomy and physiology of plant cells. He was also first to propose that new cells are formed by cell division. He saw that the nucleus of the cell was within the granular, colloidal material that made up the main substance of the cell. In 1846, he named this substance protoplasm (a word invented by the Czech physiologist Jan Evangelista Purkinje to describe the embryonic material found in eggs). He carefully described (1835-39) some details of mitosis in plants, a process he observed in the alga Conferva glomerata. He recorded the appearance of the cell plate between daughter cells. He remarked, “Cell division is everywhere easily and plainly seen...in terminal buds and root tips.”
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