Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ ¹ ² ³ °
 

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Brain Teasers(1) Number grid Character is who you are when no one is looking. #2 20060311 17:56:55
Re: Brain Teasers(2) Two mistaken students Character is who you are when no one is looking. #4 20060311 18:12:40
Re: Brain Teasersjustlookingforthemoment, Character is who you are when no one is looking. #5 20060311 23:25:35
Re: Brain TeasersOh, okay. I thought it was the number of times each digit appeared in the whole grid. But it is only meant to be counting the digits in the top number (is that right?). #7 20060312 01:51:19
Re: Brain TeasersSorry, posted wrong answer to (2)! Try again!! Last edited by ashwil (20060312 02:08:06) #8 20060312 02:31:06
Re: Brain TeasersThe answer to (1) is correct, ashwil! Excellent! Character is who you are when no one is looking. #9 20060312 02:35:40
Re: Brain Teasers(3) You may use any mathematical sign such as +,, x, ÷ and exponentiation (power). Get exactly 1,000 using Character is who you are when no one is looking. #13 20060312 02:48:59
Re: Brain TeasersOnce 3(a) and 3(b) are answered, 3(c), (d), (e) are just extensions of the same principles #15 20060312 16:31:42
Re: Brain Teasers(4) A little girl I know sells oranges from door to door. One day while on her rounds, she sold ½ an orange more than half her oranges to the first customer. To the second customer she sold ½ an orange more than half of the remainder and to the third and last customer, she sold ½ an orange more than half she now had, leaving her none. Character is who you are when no one is looking. #16 20060312 20:08:54
Re: Brain Teasers(5)The difference of the squares of two whole numbers is a cube and difference of their cubes is a square. Can you find the smallest pair of such numbers? Character is who you are when no one is looking. #17 20060313 01:17:34
Re: Brain Teasers(6) Can you split the number 34 into two parts such that 4/7 of one part is equal to 2/5 of the other? Character is who you are when no one is looking. #18 20060313 01:57:11
Re: Brain Teasers
Why did the vector cross the road? It wanted to be normal. #19 20060313 02:10:42
Re: Brain TeasersCorrect, mathsyperson! Character is who you are when no one is looking. #20 20060313 14:14:12
Re: Brain Teasers(7) I asked the captain of a ship how old the ship was. He pointed to a boiler in the ship and said, "The ship is twice as old as the boiler was when the ship was as old as the boiler is now. The combined age of the ship and the boiler is thirty years." Character is who you are when no one is looking. #21 20060313 19:20:55
Re: Brain Teasers(8) A man is 6 years older than his wife. Four years ago, he noticed that he had been married to her for half his lif. Character is who you are when no one is looking. #22 20060314 15:02:37
Re: Brain Teasers(9) There are many factorials that can be expressed as the produce of two or more other factorials. For example, 7! x 6! = 10!. Can you think of any other? Character is who you are when no one is looking. #23 20060314 19:18:20
Re: Brain Teasers(14) When Dr. Cohen finally finished typing her treatise, "The Sleeping Habits of Colombian Edible Ants", she was rather suprised to notice thatm the number of digits she used to number its pages was exactly a multiple of the number of pages in the treatise itself. This substantial piece of work contains over 1,000 pages, but fewer than 10,000. Exactly how many pages does it contain? Character is who you are when no one is looking. #24 20060314 19:26:21
Re: Brain Teasers(15) There are 100 marbles in five bags. If the first and second bags contain between them 52 marbles, the second and third together contain 43, the third and fourth contain 34, and the fourth and fifth contain 30 marbles, how many marbles are there in each bag? Character is who you are when no one is looking. #25 20060316 02:58:59
Re: Brain Teasers
Character is who you are when no one is looking. 