Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

kmeds16

  • 2 years ago

In a family, each boy has as many sisters as brothers, but each sister has only half as many sisters as brothers. How many children are there in the family?

  • This Question is Closed
  1. goformit100
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok

  2. kmeds16
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @Decart show me the solution please :)

  3. kmeds16
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Ah ok I got it by fingers. But is there any mathematecal equation to solve this kind of problem? Its like a riddle.

  4. Decart
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    boys = x girls = y

  5. campbell_st
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    there are 7 children, 4 boys and 3 girls...

  6. kmeds16
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @campbell_st can you show me your solution?

  7. campbell_st
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    plenty of options...

  8. cwrw238
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    i find this quite tricky..

  9. Decart
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    two equations two unknowns

  10. campbell_st
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    if you rewrite Decarts equations you have y = -1 and 0.5y - x = 1

  11. kmeds16
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    oh wait. im still trying to figure it out. its tricky :/

  12. campbell_st
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    for me it was trial and error knowing that there needed to be an odd number of children I knew 3 doesn't work, 5 works for the boy having equal sisters and brothers but doesn't work for the girl, so try 7 works

  13. cwrw238
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    - thats probably the best way i've got a headache trying to create the equations

  14. Decart
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    but we can get them

  15. cwrw238
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    maybe i need another coffee - lol

  16. kmeds16
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @cwrw238 haha, my brother too. until he left me here alone :/

  17. Decart
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    brother = x+y sister=x+.5y

  18. Decart
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    .5y when we took one away

  19. Decart
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    sister = 2x+y

  20. Decart
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    brother is actually x+1

  21. Decart
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    x+1brother has x-1+y x-1 being himself

  22. cwrw238
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    1 + 2x = x + y where x = girls, y = boys is one equation

  23. Decart
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    x+1+y=y-1+2x

  24. cwrw238
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    that gives x + 1 = 1 + 2x giving x=0

  25. kmeds16
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    i formulated an equation XD x - 1 = y y - 1 = x/2

  26. cwrw238
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    x - 1 = 0.5y is another so u have 1 + 2x = x + y x -1 = 0.5y is that right??

  27. kmeds16
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @cwrw238 i'll try to solve yours & you try mine :)

  28. cwrw238
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yes that gives x = 3 y=4

  29. cwrw238
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    oh ok

  30. Decart
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    awesome

  31. cwrw238
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    x - 1 = y y - 1 = 0.5x add x - 2 = 0.5x x = 4 y = 4-1 = 3

  32. cwrw238
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    in your equation x = boys , y = girls right? yours come out right too

  33. kmeds16
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    ya and yours is x = girls and y = boys,right?

  34. cwrw238
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yea well done

  35. kmeds16
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    thank you @cwrw238 :)

  36. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.