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

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Oral puzzlesThese questions are to be answered orally, within a minute, without the use of paper, pen/pencil and calculator. Character is who you are when no one is looking. #2 20060313 14:27:18
Re: Oral puzzles4. The difference between two numbers is 3 and the difference between their squares is 51. Find the numbers. Character is who you are when no one is looking. #3 20060313 16:43:58
Re: Oral puzzles5. Which are the three integers, in Arithmetic Progression, whose produce is a prime number? Character is who you are when no one is looking. #4 20060313 17:02:28
Re: Oral puzzles6. $434$0 is a number divisible by 36 where $ represent a single digit 0,1,2,3,4,5,6,7,8, or 9. What number does $ represent? Character is who you are when no one is looking. #5 20060313 17:27:58
Re: Oral puzzles7. Driving through the country leisurely, I travelled 7 miles on the first day, and increased my travel each day by 4 miles, travelling 51 miles on the last day. How many days did I travel and what was the total distance I covered? Character is who you are when no one is looking. #6 20060314 00:38:24
Re: Oral puzzles3, 5, 6 and 7 remain. I have no idea what aggregates are, I can't think of any solution for 5, I got 6 but in more than a minute and I'd never be able to do 7 in a minute either. Why did the vector cross the road? It wanted to be normal. #7 20060314 01:54:36
Re: Oral puzzlesmathsyperson, Character is who you are when no one is looking. #8 20060314 15:18:01
Re: Oral puzzles10. Can you tell the biggest number that can be formed using four 1s? Character is who you are when no one is looking. #9 20060315 03:16:21
Re: Oral puzzles10. Urm, 1111? I have a feeling that's too simple though. Why did the vector cross the road? It wanted to be normal. #10 20060315 03:33:42
Re: Oral puzzlesAnswers to 11, 13, 14 are correct, mathsyperson! Character is who you are when no one is looking. #11 20060315 15:24:10
Re: Oral puzzles16. If 6 men can pack 6 packets of candy in 6 minutes, how many men are required to pack 60 packets in 60 minutes? Character is who you are when no one is looking. #12 20060316 03:24:22
Re: Oral puzzles16. Answered, but not in time. I'm kicking myself about it now though. Why did the vector cross the road? It wanted to be normal. #13 20060316 06:22:00
Re: Oral puzzlesmathsy, 2 easy ways of getting approximate answers to 20 without a calculator: #14 20060316 15:04:37
Re: Oral puzzlesExcellent, mathsyperson, and ashwil! Character is who you are when no one is looking. #15 20060316 22:22:25
Re: Oral puzzles21. Which of these is the greatest fraction? Character is who you are when no one is looking. #16 20060316 23:01:44
Re: Oral puzzles26. A father is 4 times his son's age. In 30 years, the son's age will be half of his father's age. What are the father's and son's ages at present? Character is who you are when no one is looking. #17 20060317 18:59:54
Re: Oral puzzles(29) A mule and a donkey were going to the market laden with wheat. The mule said, "if you give me one measure, Iwould be carrying twice as much as you, but if I give you one, we would be having equal measures." What were their burdens? Character is who you are when no one is looking. #18 20060317 20:36:20
Re: Oral puzzles26  the son : 15 and the father : 60 ImPo$$!BLe = NoTH!nG Go DowN DeeP iNTo aNyTHinG U WiLL FinD MaTHeMaTiCs ... #19 20060317 21:25:17
Re: Oral puzzlesRauLiTo, Character is who you are when no one is looking. #20 20060318 18:24:18
Re: Oral puzzles34. If the product of two numbers is 320 and their ratio is 1:5, what is the difference between the squares of these two numbers? Character is who you are when no one is looking. #21 20060319 15:38:26
Re: Oral puzzles37. What is the value of tan1° tan2° tan3° .......tan88° tan89°? Character is who you are when no one is looking. #22 20060320 00:54:40
Re: Oral puzzlesNice puzzle, ganesh. I liked this one very much. Why did the vector cross the road? It wanted to be normal. #23 20060320 01:37:13
Re: Oral puzzlesVery good, mathsyperson! Character is who you are when no one is looking. #24 20060323 14:09:24
Re: Oral puzzles38. Two persons start walking at a steady pace of 3 km/hour from a road intersection along two roads that make an angle of 60° with each other. What will be the shortest distance separating them at the end of 20 minutes? Character is who you are when no one is looking. #25 20060324 14:40:26
Re: Oral puzzles44. A rectangle has perimeter of 50 metres. If its length is 13 metres more than its breadth, what is its area? Character is who you are when no one is looking. 