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MATH PUZZLE: Can you replace...

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

Correct answers: 4205

The first user who solved this task is Donya Sayah30.

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Meccano patent

In 1901, the first application for a patent for Meccano was submitted, as "Improvements in toy or educational devices for children and young people. Known at first as "Mechanics Made Easy," this invention of Frank Hornby became a worldwide success. The British patent (No. 587) showed the familiar perforated strips, pulleys, axles, brackets and clips assembled as a model railway crane with tracks that had operating points. The patent was published on 30 Nov 1901.«

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