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sara ghorbani

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MATH PUZZLE: Can you replace the question mark with a number?
Look at the picture, determine the pattern and replace the question mark with a number.
MATH PUZZLE: Can you replace the question mark with a number?

Bauxite discovered in France

In 1821, bauxite, an aluminium ore, was discovered in southern France near the village of Les Baux by Pierre Berthier. This hard, reddish, clay-like material contains about 50% hydrated aluminium oxide with impurities such iron oxide. It was named "beauxite," after the village, by P. A. Dufrenoy (1847), but changed to "bauxite" by E. H. Sainte-Claire Deville (1861). At first, it was so difficult to extract the metal, it was more valuable than gold. In 1855, a bar of aluminium was exhibited beside the Crown Jewels at the Paris Exhibition. The great abundance of the ore, and the discovery (1886) of refining using electricity independently by Charles Hall and Paul Louis Toussaint Heroult made the metal inexpensive.«

The supervisor for the Union O...

The supervisor for the Union Of Road Construction Workers called the meeting to order.
"Men -- we've agreed on a new deal with the state. We'll no longer have to work four days a week!"
"HOORAY!!!" the crowd cheered.
"We'll quit work at 4PM and not 5PM!"
"HOORAY!!!" the crowd roared.
"We don't have to be in until 11AM instead of 10AM!"
"HOORAY!!!" the crowd thundered.
"And now, even though 99% of the roads in the country are blocked by orange barrels, we'll only have to work on Wednesdays!!"
Silence.
A voice from the back of the room asks, "You mean, EVERY Wednesday?"
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