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MATH PUZZLE: Can you replace...

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

Correct answers: 351

The first user who solved this task is Linda Tate Young.

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Preach A Good Sermon

The preacher's 5-year-old daughter noticed that her father always paused and bowed his head for a moment before starting his sermon. One day, she asked him why.
"Well, Honey," he began, proud that his daughter was so observant of his messages, "I'm asking the Lord to help me preach a good sermon."
"How come He doesn't answer it?" she asked.

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Black American invention

In 1888, a U.S. patent was issued for the railway signal to the Black American inventor, A.B. Blackburn (No. 376,362). The type of signal was that designed to be operated by the wheels of a train. A lever was depressed as a train wheel travelled over it, to remotely operate an alert through a mechanical linkage upon the passing of the train. It was designed for use upon a single track railway line for trains passing in one direction. To provide a signal for trains passing in the opposite direction, a similar apparatus would be applied on the opposite rail. This patent was an improvement in mechanical design of his earlier patent No. 309,517 on 23 Dec 1884, in which he also described how a gong was activated to provide the alert.«[Image: detail from patent diagram showinf device beside a section of rail.]

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