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MAGIC SQUARE: Calculate A-B+C

The aim is to place the some numbers from the list (9, 13, 15, 16, 18, 20, 21, 33, 35, 36, 75, 90) 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.
The first user who solved this task is Nasrin 24 T.
#brainteasers #math #magicsquare

Two blondes were recently observed in a parking lot trying to unlock the door of their Mercedes with a coat hanger. Here is their dialogue:
Blonde One: I can't seem to get this door unlocked!
Blonde Two: Well, you'd better hurry up and try harder! it's starting to rain, and the top is down!
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U.S. astronomy

In 1739, John Winthrop (12 Dec 1714-1779) of Cambridge, Mass., the first astronomer of note in the U.S. began sunspot observations and continued over the next two days. No observations were possible on 21 Apr due to cloudy weather. His observations exist as one-page reports in the University Archives of Harvard University, though they were never published. In 1761, he went on an expedition to St. John's, Newfoundland, to observe the transit of Venus across the sun on 6 Jun 1761, which measurements could be used to compute the distance between the sun and the Earth. He also observed the transit of 1769 from Cambridge.«
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