MATH PUZZLE: Can you replace...
MATH PUZZLE: Can you replace the question mark with a number?Correct answers: 73
The first user who solved this task is Djordje Timotijevic.
#brainteasers #math #riddles
AC power plantIn 1886, America's first demonstration of the alternating-current system provided lighting along Main Street at Great Barrington, Massachusetts. The power came from the first AC power plant in the U.S. to begin commercial operation. With this project, its creator, George Westinghouse, now thirty-nine years old, began a new direction in his career. |