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Nílton Corrêa De Sousa

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The aim is to place the some numbers from the list (4, 6, 8, 10, 11, 15, 53, 72, 74, 79) into the empty squares and squares marked with A, B an C. Sum of each row and column should be equal. All the numbers of the magic square must be different. Find values for A, B, and C. Solution is A+B-C.
If a9a91 - ac9b9 = 6c2 find number abc. Multiple solutions may exist.
Can you replace the question mark with a number?

Johannes Stark

Died 21 Jun 1957 at age 83 (born 15 Apr 1874).German physicist who won the 1919 Nobel Prize for Physics for his discovery in 1913 that an electric field would cause splitting of the lines in the spectrum of light emitted by a luminous substance; the phenomenon is called the Stark effect.

One-armed butlers

'One-armed butlers - they can take it but they can't dish it out.'

Tim Vine (March 4 1967-)

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