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0 / 60 seg.
A book slipped from a man's hands and fell on the floor with a loud noise. 20 eyes looked at him. How many people were in the library?
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Clue
11 PEOPLE WERE IN THE LIBRARY. WE HAVE 2 EYES EACH, AND THERE WAS NO MENTION ABOUT THE PAIRS OF EYES. SO WE HAVE 10 PEOPLE IN ADDITION TO THE MAN WHO DROPPED THE BOOK. HE CAN'T LOOK AT HIMSELF, BUT HE'S STILL IN THE LIBRARY
THERE ARE 9 BOOKS ON THE SHELF. THERE ARE 3 BOOKS TO THE LEFT AND 5 BOOKS TO THE RIGHT. IN TOTAL, THERE ARE 3 + 5 + 1 BOOKS
IT IS NOT POSSIBLE TO GUESS ONLY THREE FRUITS CORRECTLY, THE FOURTH FRUIT WILL BE CORRECT TOO! SO NOBODY HAS GUESSED THREE FRUITS CORRECTLY AND SO 10 (123 - 43 - 39 - 31 = 10) PEOPLE HAVE GUESSED FOUR FRUITS CORRECTLY
THE TRAIN IS ABOUT TO LEAVE AND YOU WILL NOT BE ABLE TO CATCH THE TRAIN. THE AMOUNT OF TIME TAKEN TO TRAVEL TO THE HALFWAY POINT AT 15 MILES AN HOUR IS THE SAME AMOUNT OF TIME TAKEN TO REACH THE TRAIN STATION WHEN TRAVELLING TO THE RAILROAD STATION AT 30 MILES AN HOUR. FOR EXAMPLE, LET'S ASSUME THAT THE DISTANCE TO TRAVEL IS 30 MILES. WHEN TRAVELLING AT 30 MILES AN HOUR, IT TAKES 1 HOUR. WHEN TRAVELLING AT 15 MILES AN HOUR, IT WILL ALREADY TAKE 1 HOUR TO REACH THE HALFWAY POINT
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