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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: 46

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

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Rabbits vs. Wolves

Two rabbits were being chased by a pack of hungry wolves. The wolves chased the rabbits into a thicket.
After a few minutes, one rabbit turned to the other and said, "Well, do you want to make a run for it, or should we stay here for a few days and out number them?"

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Iron railway bridge collapse

In 1849, an iron railway bridge near Mast Hope, Pennsylvania, collapsed as a stock train was crossing. The engineer heard a loud cracking, pulled the throttle wide open, and succeeded in getting the engine across in safety. However, the rest of the train fell into the deep ravine of the Westcolang Creek along with the wrecked bridge. A brakeman and two stockmen lost their lives. The New York and Erie Railroad had that year experimented by building three iron bridges, including the one that failed. In 1850, an article in the Scientific American magazine reported that the company, having lost confidence in iron bridges, would tear down the two remaining and replace them with wooden structures.«

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