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MATH PUZZLE: Can you replace...

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

Correct answers: 297

The first user who solved this task is Pratima Singh.

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My girlfriend complained

My girlfriend complained I never took her anywhere, so we went to the Grand Canyon so she felt valley dated.

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Traffic signal

In 1923, African-American Garrett Morgan (1877-1963) patented an automatic traffic signal. He later sold the technology for the Morgan traffic signal to General Electric Corporation for $40,000. His invention came after he had seen an automobile crash into a horse-drawn carriage. Morgan was distressed by that traffic accident, and so he developed a new way to make streets safer for motorists and pedestrians.

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