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8) 9 + 9 + 9 -2 = 25 + 2 -2 (adding -2 to both sides of the equation to cancel the +2 on the right side, which means the bellhop returned the tip or gave a discount of $2) 9) 9 + 9 + 9 - 2 = 25 10) 27 - 2 = 25 11) 25 = 25. The puzzle should subtract the bellhop's tip from the $27 rather than add it. History. There are many variants of the puzzle.
Two views of the utility graph, also known as the Thomsen graph or. The classical mathematical puzzle known as the three utilities problem or sometimes water, gas and electricity asks for non-crossing connections to be drawn between three houses and three utility companies in the plane. When posing it in the early 20th century, Henry Dudeney ...
Monty Hall problem. In search of a new car, the player chooses a door, say 1. The game host then opens one of the other doors, say 3, to reveal a goat and offers to let the player switch from door 1 to door 2. The Monty Hall problem is a brain teaser, in the form of a probability puzzle, based nominally on the American television game show Let ...
The outer zone is worth 1 point, then 2, 3, etc. The center is worth 10 points. 5 + 8 + 8 + 9 = 30. Strike. Math puzzle. ... How many of these tricky brain teasers can you answer correctly?
One can argue about the answers of many brain teasers; in the given example with hens, one might claim that all the eggs in the question were laid in the first day, so the answer would be three. Q: Mary's father has five daughters: 1. Nana, 2. Nene, 3. Nini, 4. Nono. What is the name of the fifth daughter? A: Mary. The first four daughters all ...
Coffee may help keep eyes healthy. Egypt's pyramid construction secret: Just add water. The dirtiest (and cleanest) produce on the market. Some of these brain teasers are pretty tough, while ...
Wolf, goat and cabbage problem. Illuminated illustration depicting the wolf, goat and cabbage problem in the Ormesby Psalter, dating to 1250–1330. The wolf, goat and cabbage problem is a river crossing puzzle. It dates back to at least the 9th century, [1] and has entered the folklore of several cultures. [2] [3]
Cheryl gives them a list of 10 possible dates: May 15, May 16, May 19. June 17, June 18. July 14, July 16. August 14, August 15, August 17. Cheryl then tells Albert and Bernard separately the month and the day of her birthday respectively.
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