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# Which number should replace the question mark?

Which number should replace the question mark?
The first user who solved this task is BrainTeasers Mozgalice.
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### A Confident Genius

A proud and confident genius makes a bet with an idiot.

The genius says, "Hey idiot, every question I ask you that you don't know the answer, you have to give me \$5. And if you ask me a question and I can't answer yours I will give you \$5,000."

The idiot says, "Okay."

The genius then asks, "How many continents are there in the world?" The idiot doesn't know and hands over the \$5.

The idiot says, "Now me ask: what animal stands with two legs but sleeps with three?"

The genius tries and searches very hard for the answer but gives up and hands over the \$5,000.

The genius says, "Dang it, I lost. By the way, what was the answer to your question?"

The idiot hands over \$5.
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### Roller coaster

In 1884, the first gravity-powered American roller coaster that was commercially successful was put in operation at Coney Island, N.Y., the invention of La Marcus Thompson (patent No. 310,966). Passengers rode a train on undulating tracks over a wooden structure 600-ft long. The train started at a height of 50-ft on one end and ran downhill by gravity until its momentum died. Passengers then left the train and attendants pushed the car over a switch to a higher level. The passengers returned to their sideways facing seats and rode back to the original starting point. Admission on the Thompson Switchback Railway was 5 cents and he grossed an average of \$600 / day. Within 4 yrs he had built about 50 more across the U.S. and in Europe.
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