Jump to content
BrainDen.com - Brain Teasers

BMAD

Members
  • Posts

    2202
  • Joined

  • Last visited

  • Days Won

    72

Community Answers

  1. BMAD's post in Bringing back an old one.... Making Toast was marked as the answer   
  2. BMAD's post in Rolling your bike was marked as the answer   
    Solution
    https://www.simonsfoundation.org/multimedia/mathematical-impressions-multimedia/the-bicycle-pulling-puzzle/
  3. BMAD's post in points in a plane was marked as the answer   
    I have
     
  4. BMAD's post in Take the last chip was marked as the answer   
    Well done! 
  5. BMAD's post in A loaded coin was marked as the answer   
    both excellent answers. 
  6. BMAD's post in A simple multiple-choice test was marked as the answer   
    I got (depending on the definition of answer)
  7. BMAD's post in Relatively prime was marked as the answer   
  8. BMAD's post in Five Points on a Sphere was marked as the answer   
  9. BMAD's post in Which clock would you prefer? was marked as the answer   
  10. BMAD's post in Rats and cats was marked as the answer   
  11. BMAD's post in Maybe factoring a polynomial completely was marked as the answer   
    ac = 2
    ad + bc = 3
    bd = -2
    c - a = -1 
    d - b = 3
     
    d = 3 + b
    b(3+b) = -2
    b2+3b+2 = 0
    (b+2)(b+1) = 0, b = -2 and d = 1 or b =-1 and d=2
     
    c - a = -1 
    c = -1 + a
    ac = 2
    a(-1+a)=2
    a2-a-2=0
    (a-2)(a+1)=0; a=2 and c =1 or a=-1 and c=-2
     
    b = -2 and d = 1 or b =-1 and d=2
     a=2 and c =1 or a=-1 and c=-2
     
    ad = 4 or 2 or -1 or -2
    bc = -2 or 4 or -1 or 2
     
    given:
    ad + bc = 3
     
    ad = 4 when bc = -1 so a = 2, d = 2, b = -1, c = 1
    ad= -1 when bc = 4 so a = -1, d = 1, b = -2, c = -2
     
    there are two answers
  12. BMAD's post in More triangles in circles was marked as the answer   
  13. BMAD's post in Forming a regular hexagon from a lattice was marked as the answer   
  14. BMAD's post in How do you shuffle cards? was marked as the answer   
  15. BMAD's post in Maximum absolute or absolute maxima was marked as the answer   
  16. BMAD's post in In BMAD we trust was marked as the answer   
  17. BMAD's post in Greatest Common Factor and Least Common Multiple was marked as the answer   
  18. BMAD's post in magic triangles was marked as the answer   
  19. BMAD's post in Sum of n consecutive integers was marked as the answer   
  20. BMAD's post in Light-bulb Problem was marked as the answer   
  21. BMAD's post in Line through a circle was marked as the answer   
    these are the solutions. Well done everyone!
  22. BMAD's post in Shuffling a Deck of Cards was marked as the answer   
  23. BMAD's post in Word Puzzles/Riddles(?) was marked as the answer   
    the answers
  24. BMAD's post in Cabbage Patch Partitions was marked as the answer   
  25. BMAD's post in Discursive Judges was marked as the answer   
×
×
  • Create New...