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Replace the question mark with a number

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

Correct answers: 70

The first user who solved this task is Eugenio G. F. de Kereki.

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Fairy tales...

When Chelsea Clinton was eight, Hillary was reading one of her favorite fairy tales.

"Mommy," asked Chelsea, "Do all fairy tales begin with "Once Upon a Time...?""

"No, dearest," replied Hillary, "sometimes they start with 'Darling, I have to work a little late at the office tonight...'"

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François Hennébique

Born 25 Apr 1842; died 20 Mar 1921 at age 78.French engineer who was an important leader in experimenting with various ways of reinforcing concrete with iron and steel. At the Paris Exposition of 1867, Hennebique saw Joseph Monier's tubs and tanks built of concrete reinforced with wire mesh, and began experimenting with ways to apply this new material to building construction, setting up his own firm (1867). First using reinforced-concrete floor slabs (1879), he progressed to a complete building system, patented 1892, using his invention of a method using hooked connections on reinforcing bars. Hennébique introduced his techniques into Britain when he was commissioned to build a new flour mill in Swansea (completed 1898). This was the first multistorey reinforced concrete building in Britain.

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