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Can you replace the question mark with a number?

MATH PUZZLE: Can you replace the question mark with a number?

Correct answers: 31

The first user who solved this task is Nasrin 24 T.

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Should Have Glasses

A policeman stops a lady and asks for her license. He says "Lady, it says here that you should be wearing glasses."
The woman answered "Well, I have contacts."
The policeman replied "I don't care who you know! You're getting a ticket!"

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Traffic lights

In 1914, a lighting ceremony was held for the first electric traffic lights used to control flow of different streams of traffic at the intersection of Euclid Ave. and E. 105th St. in Cleveland, Ohio. The traffic signals were red and green lights on street-corner poles, wired to a manually operated switch housed inside a control booth beside the road. The switch design prevented conflicting signals. A bell warned the drivers of colour changes. The installation by the American Traffic Signal Co. was modelled after a system patented by James Hoge (U.S. No. 1,251,666). The first traffic control light used a gas-lit lantern, in London, England (10 Dec 1868).«

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