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Darko Nesovic

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last 3 solved tasks
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.
If 8c3aa + 3c22c = bbc58a find number abc. Multiple solutions may exist.

First U.S. commercial gasoline engine

In 1872, George B. Brayton of Boston, Mass. (3 Oct 1830 - 17 Dec 1892) received a U.S. patent for a gas-powered engine (No. 125,166). He did pioneering work inventing this first American commercial internal combustion engine, which he manufactured and sold. Its principle of continuous ignition later became the basis for the turbine engine. A pressurized air-fuel mixture from a reservoir was ignited upon entering a water-cooled cylinder. The Brayton engine was tried in watercraft, one of John Holland's submarines and one for a few months installed in a carriage (1872-3). He held British patent Jul 1890, No. 11,062.«

Full payment

Two women are walking down the street when a mugger approaches them and demands their money.

They both grudgingly pull out their wallets and begin taking out their cash.

Just then, the woman turns to the other and hands her a bill.

"Here’s that $20 I owe you," she says.

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