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Replace the question mark with a number

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

Correct answers: 786

The first user who solved this task is Erkain Mahajanian.

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Good News, Bad News

After Friday prayers an Imam announced to the people: "I have good news and bad news. The good news is, we have enough money to pay for our new building program. The bad news is, it's still out there in your pockets."-

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Edward Griffith Begle

Died 2 Mar 1978 at age 63 (born 27 Nov 1914). American mathematician, a topologist, who led development of “new math.” When the Soviet Union launched the Sputnik satellite (1957), beating the U.S. into space, the effectiveness of science and mathematics education in American schools came under scrutiny. Begle's idea was to replace the traditional focus on mathematics as memorization and algorithmic computation. Instead, he designed a program to emphasise the fundamental importance of understanding the principles of mathematics. He directed (1958-72) the School Mathematics Study Group, funded by the National Science Foundation. SMSG produced teaching materials for all grade levels with this approach. Ultimately, initiating lasting reform through teachers was unsuccessful.«

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