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BrainDen.com - Brain Teasers


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Everything posted by BMAD

  1. On the right track but see if you can find what x is approaching.
  2. I have a negative value for x as my min and a different x max This is not the answer but as an example of this possibility:
  3. Suppose we have the following system x^2+y^2=r; x+y=r, such that the line crosses the circle at exactly two places. Obviously with two equations and three variables, we have a solution set of answers that can satisfy the given conditions. What I want to know is of the given solutions that satisfies this problem, what is the smallest and largest values x can possibly be?
  4. I think you are on the right track rocdocmac
  5. you have not proven nor disproven this
  6. I have in mind a number which, when you remove the units digit and place it at the front, gives the same result as multiplying the original number by 2. Am I telling the truth?
  7. Three slices of bread are to be toasted under a grill. The grill can hold two slices at once but only one side is toasted at a time. It takes 30 seconds to toast one side of a piece of bread, 5 seconds to put a piece in or take a piece out and 3 seconds to turn a piece over. What is the shortest time in which the three slices can be toasted?
  8. You have the right idea with your comment. I an designing a cut as a swipe of the knife, so lining them up and then cutting with one swipe would count as one cut.
  9. I wish to share 30 identical individual sausages equally amongst 18 people. What is the minimum number of cuts I need to make? What is the minimum number of pieces I need to create?
  10. BMAD


    Assume that only four buttons work on your calculator: 5, 7, enter, and plus. What whole numbers can you not use your calculator to make?
  11. yes, this is what I mean.
  12. James and Mike are running in a race. They both walked and ran for part of the rate. They each walked and ran at the same speed. James ran for half the distance and walked for half the distance. Mike ran for half of his time and walked for half of his time. Who finished first?
  13. All you showed is the bound is wider than one thought.
  14. So then if we know N and P we should be able to bound squares x by a two values. Are those values always consecutive?
  15. Find a function where the arc lenth and area between any two randomly defined points is the same. There are two.
  16. Say we have the function: y=x^x^x^x^x..... Find an x value for which the derivative of this function converges. If you are really clever you'll find the interval that converges.
  17. Hmmmm, my answer was the reciprocal of yours. Maybe I am wrong. Can you support your answer?
  18. Write the complex form (a + bi) for: Sqrt ( i )
  19. Find the Limit as n goes to infinity for: (1^n + 2^n + 3^n + 4^n....+ n^n) ---------------------over--------------------- (n^1+ n^2 + n^3 + n^4 ... + n^n)
  20. I agree that it will vary but we can bound the area.
  21. Suppose you have a triangle that has 2-1 inch lengths. Divide this triangle into half by drawing a line from vertex between the two identical sides, choose one of the sides randomly and shade it. The non-shaded side is cut in half again. Choose one of these sides randomly and cut it in half again shading one random piece. If this pattern of cut, shade, cut, cut, shade, cut, cut, shade cut, cut,.... was to be continued forever, what would be the area of the shaded region?
  22. Maybe one of you answered this question: :) I should have included this pic though...
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