BRAIN TEASERS

# Calculate the number 120

Calculate the number 120 using numbers [4, 3, 9, 3, 15, 75] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
The first user who solved this task is Sanja Šabović.
#brainteasers #math

### Klopman diamond....

A businessman boarded a plane to find, sitting next to him, an elegant woman wearing the largest, most stunning diamond ring he had ever seen. He asked her about it.

"This is the Klopman diamond," she said. "It is beautiful, but there is a terrible curse that goes with it."

"What's the curse?" the man asked.

"Mr. Klopman."

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### James Lind

Died 13 Jul 1794 at age 77 (born 4 Oct 1716). Scottish physician, “founder of naval hygiene in England,” who investigated sickness of sailors. On 20 May 1747, while a ship's surgeon on the HMS Salisbury, he began an experiment to remedy scurvy. He regulated the diets of the sailors, and especially included lemons and oranges. With a clearly positive outcome, he recommended fresh citrus fruit and lemon juice be incorporated in the diet of seamen on long voyages. When made a requirement by Sir Gilbert Blane, this resulted in the prompt eradication of scurvy from the British Navy. (The Dutch had implemented this practice almost two centuries earlier.) Lind also recommended shipboard delousing procedures and suggested the use of hospital ships for sick sailors in tropical ports. In 1761, he arranged for the shipboard distillation of seawater for drinking water.[World of Health gives birth data as 4 Oct 1716. EB gives only the year 1716.]
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