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Zorica Bera

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last 3 solved tasks
If 828ba - 52bc7 = 3b787 find number abc. Multiple solutions may exist.
The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
NUMBERMANIA: Calculate the number 8586 using numbers [9, 1, 3, 9, 67, 884] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Leonid Vitalyevich Kantorovich

Born 19 Jan 1912; died 7 Apr 1986 at age 74.Soviet mathematician and economist who shared the 1975 Nobel Prize for Economics with Tjalling Koopmans for their work on the optimal allocation of scarce resources. Kantorovich's background was entirely in mathematics but he showed a considerable feel for the underlying economics to which he applied the mathematical techniques. He was one of the first to use linear programming as a tool in economics and this appeared in a publication Mathematical methods of organising and planning production which he published in 1939. The mathematical formulation of production problems of optimal planning was presented here for the first time and the effective methods of their solution and economic analysis were proposed.

Late Bus

Two old women were sitting on a bench waiting for their bus. The buses were running late, and a lot of time passed. Finally, one woman turned to the other and said, "You know, I've been sitting here so long, my butt fell asleep!'.
The other woman turned to her and said "I know! I heard it snoring!"

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