BRAIN TEASERS

# MAGIC SQUARE: Calculate A*B-C

The aim is to place the some numbers from the list (12, 14, 16, 17, 21, 25, 26, 35, 38, 39, 40) 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 Nílton Corrêa De Sousa.
#brainteasers #math #magicsquare

### Why English is tough

Twenty-one reasons why English is hard to learn.
1. The bandage was wound around the wound.
2. The farm was used to produce produce.
3. The dump was so full it had to refuse more refuse.
4. We must polish the Polish furniture.
6. The soldier decided to desert his dessert in the desert.
7. Since there was no time like the present, he thought it was time to present the present.
8. A bass was painted on the head of the bass drum.
9. When shot at, the dove dove into the bushes.
10. I did not object to the object.
11. The insurance was invalid for the invalid.
12. There was a row among the oarsmen on how to row.
13. They were too close to the door to close it.
14. The buck does funny things when does are present.
15. A seamstress and a sewer fell down into a sewer line.
16. To help with planting, the farmer taught his sow to sow.
17. The wind was too strong to wind the sail.
18. After a number of injections my jaw got number.
19. Upon seeing the tear in the painting I shed a tear.
20. I had to subject the subject to a series of tests.
21. How can I intimate this to my most intimate friend?
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### Envelope machine patent

In 1849, the first U.S. patent for an envelope-making machine was issued to Jesse K. Park and Cornelius S. Watson of New York City (No. 6055). It was never used commercially, as it was shortly superceded by patents on improved machines by other inventors. It was treadle-operated and its mechanism included a stamper rod, gumming apparatus and folding apparatus. The patent model still exists in the collection of the National Postal Museum.«
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