Thread: Math problem

Page 1 of 2 12 LastLast
Results 1 to 15 of 17
  1. #1
    Bernard.'s Avatar
    Join Date
    Apr 2011
    Gender
    male
    Posts
    24,515
    Reputation
    2110
    Thanks
    2,985
    My Mood
    Bored

    Math problem

    If Juan gives Isaih 30 marbles, than Isaih will have twice as many marbles as Juan. If Isaih gives Juan 50 marbles, Juan will have 3 times more than Isaih. How many marbles does Juan have?

    (What is the equation?)
    Rep. Power: 111

    Minion: 11/28/12-3/15/14

  2. #2
    iFresh's Avatar
    Join Date
    Aug 2012
    Gender
    male
    Location
    The Lightning
    Posts
    501
    Reputation
    71
    Thanks
    164
    My Mood
    Inspired
    Is the first 30 marbles included in the second 50 marbles?

  3. #3
    Bernard.'s Avatar
    Join Date
    Apr 2011
    Gender
    male
    Posts
    24,515
    Reputation
    2110
    Thanks
    2,985
    My Mood
    Bored
    Quote Originally Posted by iFresh View Post
    Is the first 30 marbles included in the second 50 marbles?
    No, its separate situations, but in both, they have the same amount.
    Rep. Power: 111

    Minion: 11/28/12-3/15/14

  4. #4
    Shane's Avatar
    Join Date
    Jul 2009
    Gender
    female
    Location
    College
    Posts
    18,804
    Reputation
    2447
    Thanks
    2,051
    My Mood
    Yeehaw
    is the equation set equal to each other? and there's a homework section if you didn't know.




    Crossfire Minion: 28 October 2010
    Official Middleman: 20 September 2012
    Trusted Member: 15 February 2013
    Official Middleman: 11 April 2013
    Official Middleman: 10 January 2015
    ---------------------------------------------------
    Global Moderator: 25 December 2012
    Head Administrator: 21 March 2013

     


    ARUNFORCE AND DAVE84311 GAY FOR EACH OTHER



  5. #5
    Arhk's Avatar
    Join Date
    Dec 2008
    Gender
    male
    Posts
    3,619
    Reputation
    35
    Thanks
    217
    My Mood
    Amused
    Quote Originally Posted by Vice-Versa View Post
    If Juan gives Isiah* 30 marbles, then* Isiah* will have twice as many marbles as Juan. If Isiah gives Juan 50 marbles, Juan will have 3 times more than Isiah. How many marbles does Juan have?

    (What is the equation?)
    x is Juan, y is Isiah
    System of equations.
    2(x- 30) = y + 30; 3(y-50) = x +50

    ~
    I'll show you how to do the work in a follow-up post.


    ---------- Post added at 11:09 PM ---------- Previous post was at 10:53 PM ----------

    Quote Originally Posted by Vice-Versa View Post
    If Juan gives Isiah* 30 marbles, then* Isiah* will have twice as many marbles as Juan
    If Juan (x) gives 30 of his marbles, he is subtracting from his own amount, and they are being added to the person he's giving them to, Isiah (y). Isiah will then have twice as many marbles after Juan loses 30 marbles (x-30) and those 30 marbles are given to Isiah (y+30). Now that Juan has lost 30 marbles (x-30) and Isiah has gained 30 marbles (y+30), Isiah has twice as many marbles, that is 2 times Juan's current amount which is (x-30), therefore 2(x-30) = y

    Quote Originally Posted by Vice-Versa View Post

    If Isiah gives Juan 50 marbles, Juan will have 3 times more than Isiah. How many marbles does Juan have?

    (What is the equation?)
    If Isiah (y) loses 50 marbles (y-50) and Juan gains 50 marbles (x + 50), Juan will have 3 times more than Isiah now has 3(y-50).
    Last edited by Arhk; 11-06-2012 at 09:57 PM.
    "If the world hates you, keep in mind that it hated me first." John 15:18

    "True strength isn't determined by when a man has a lot and gives enough, but when he has nothing left but keeps on giving."
    "A man is determined by the strength of his will."
    "Courage has nothing to do with ascertaining any sense of certainty, but the will to go on even
    in the face of uncertainty." - Arhk



  6. #6
    unicorn69's Avatar
    Join Date
    Jun 2010
    Gender
    male
    Location
    New York
    Posts
    1,112
    Reputation
    -147
    Thanks
    55
    My Mood
    Fine
    If a snowball melts so that its surface area decreases at a rate of 5 cm2/min, find the rate at which the diameter decreases when the diameter is 8 cm. (Give your answer correct to 4 decimal places.)

    Since we're on the topic of hw, can someone help me solve this?

  7. #7
    Arhk's Avatar
    Join Date
    Dec 2008
    Gender
    male
    Posts
    3,619
    Reputation
    35
    Thanks
    217
    My Mood
    Amused
    2(x- 30) = y + 30; 3(y-50) = x +50

    Your teacher may have some sort of short version of doing this, but as a future engineer I don't believe in not working step-by-step. And being honest all of those short-cut methods are what fuck you up in advanced mathematics.

    Solving for 'y' in the first equation; subtracting 30 from each side to attain 'y' -> 2(x- 30) - 30 = y; substitute 'y' in the next equation with it's equivalent "2(x- 30) - 30"
    3 { [2(x- 30) - 30] - 50 } = x + 50: to make things more simple we're going to perform the multiplication operations on the left-side ->
    3[ (2x-60-30) - 50] = x + 50: Let's go ahead and perform the simple subtraction operation now in the left-hand side of the problem before going on with multiplying ->
    3[(2x-90)-50] = x + 50; Now let's perform the left-side operation of multiplying by 3 -> (6x-270) - 150 = x + 50:keep going -> 6x - 420 = x + 50: subtracting 50 from both sides -> 6x - 470 = x: subtracting x-> 5x - 470 = 0:5x must be equal to 0, aka -> 5x = 470; x = 94
    "If the world hates you, keep in mind that it hated me first." John 15:18

    "True strength isn't determined by when a man has a lot and gives enough, but when he has nothing left but keeps on giving."
    "A man is determined by the strength of his will."
    "Courage has nothing to do with ascertaining any sense of certainty, but the will to go on even
    in the face of uncertainty." - Arhk



  8. The Following User Says Thank You to Arhk For This Useful Post:

    Bernard. (11-07-2012)

  9. #8
    Rattle's Avatar
    Join Date
    Aug 2010
    Gender
    male
    Location
    Crack House
    Posts
    11,652
    Reputation
    1343
    Thanks
    2,498
    My Mood
    Cynical
    Wow I completely forgot about the HW section. Never really used it since... well you know google.
    Previous Name: Woods / Opticz
    • Minecraft Minion from: September 28th, 2011 - December 8th, 2013
    • League Of Legends Minion from: October 16th, 2011 - March 30th, 2012
    • AVA Minion from: January 6th, 2012 - March 30th, 2012
    • Battlefield Minion from: February 3rd, 2013 - December 8th, 2013
    • Combat Arms Wiki Editor from: June 15, 2011 - July 4, 2011
    Proud to be a part of the first gen. MPGH Editors.

    Contact:
    Email: realmpghwoods@gmail.com
    Skype: mpghwoods


  10. #9
    unicorn69's Avatar
    Join Date
    Jun 2010
    Gender
    male
    Location
    New York
    Posts
    1,112
    Reputation
    -147
    Thanks
    55
    My Mood
    Fine
    Quote Originally Posted by Alday View Post
    Wow I completely forgot about the HW section. Never really used it since... well you know google.
    It's kinda hard to find it.

  11. #10
    Arhk's Avatar
    Join Date
    Dec 2008
    Gender
    male
    Posts
    3,619
    Reputation
    35
    Thanks
    217
    My Mood
    Amused
    2(x- 30) = y + 30; 3(y-50) = x +50: we've established x = 94; -> 3(y-50) = 144: performing the left-side multiplication operation -> 3y - 150 = 144:
    adding 150 to both sides 3y = 294: -> dividing by 3, both sides -> y = 98

    ~
    And for future reference you can go to https://www.wolframalpha.com
    and simply enter the system of equations you found, 2(x- 30) = y + 30; 3(y-50) = x +50; and it'll give you the variable values.
    Last edited by Arhk; 11-07-2012 at 06:43 AM.
    "If the world hates you, keep in mind that it hated me first." John 15:18

    "True strength isn't determined by when a man has a lot and gives enough, but when he has nothing left but keeps on giving."
    "A man is determined by the strength of his will."
    "Courage has nothing to do with ascertaining any sense of certainty, but the will to go on even
    in the face of uncertainty." - Arhk



  12. #11
    Slendyy's Avatar
    Join Date
    Oct 2012
    Gender
    male
    Location
    Unknown
    Posts
    1,323
    Reputation
    10
    Thanks
    306
    My Mood
    Cool
    Lol that @Arhk trying his best haha

  13. #12
    Hux's Avatar
    Join Date
    Mar 2011
    Gender
    male
    Location
    Candy Kingdom
    Posts
    6,830
    Reputation
    588
    Thanks
    779
    My Mood
    Brooding
    Quote Originally Posted by Alday View Post
    Wow I completely forgot about the HW section. Never really used it since... well you know google.
    i personally like the bing search engine better.

  14. #13
    Arhk's Avatar
    Join Date
    Dec 2008
    Gender
    male
    Posts
    3,619
    Reputation
    35
    Thanks
    217
    My Mood
    Amused
    Quote Originally Posted by Slendyy View Post
    Lol that @Arhk trying his best haha
    Actually for me this is very simple, I already had the actual answer in a minute, it's just that I want him to understand but I was too tired to work-out the problem quickly last night.
    ~
    Engineering mathematics is much more complex algebraically.


    ---------- Post added at 07:53 AM ---------- Previous post was at 07:47 AM ----------

    It made me laugh at first, even in middle-school I could have solved this easily.
    ~
    Last edited by Arhk; 11-07-2012 at 06:48 AM.
    "If the world hates you, keep in mind that it hated me first." John 15:18

    "True strength isn't determined by when a man has a lot and gives enough, but when he has nothing left but keeps on giving."
    "A man is determined by the strength of his will."
    "Courage has nothing to do with ascertaining any sense of certainty, but the will to go on even
    in the face of uncertainty." - Arhk



  15. #14
    Rattle's Avatar
    Join Date
    Aug 2010
    Gender
    male
    Location
    Crack House
    Posts
    11,652
    Reputation
    1343
    Thanks
    2,498
    My Mood
    Cynical
    Quote Originally Posted by Lemongrab View Post
    i personally like the bing search engine better.
    I think the name Bing is retarded. Loool. But I barely use it so I wouldn't know xD
    Previous Name: Woods / Opticz
    • Minecraft Minion from: September 28th, 2011 - December 8th, 2013
    • League Of Legends Minion from: October 16th, 2011 - March 30th, 2012
    • AVA Minion from: January 6th, 2012 - March 30th, 2012
    • Battlefield Minion from: February 3rd, 2013 - December 8th, 2013
    • Combat Arms Wiki Editor from: June 15, 2011 - July 4, 2011
    Proud to be a part of the first gen. MPGH Editors.

    Contact:
    Email: realmpghwoods@gmail.com
    Skype: mpghwoods


  16. #15
    Wolf's Avatar
    Join Date
    Jul 2009
    Gender
    male
    Location
    666
    Posts
    12,422
    Reputation
    286
    Thanks
    1,156
    some sort of make-shift terrorist bomb.

Page 1 of 2 12 LastLast

Similar Threads

  1. Math problem...
    By Capevaldo in forum Homework & Learning Section
    Replies: 4
    Last Post: 05-12-2011, 02:01 PM
  2. some maths problems
    By napster835 in forum Homework & Learning Section
    Replies: 4
    Last Post: 11-30-2010, 04:16 PM
  3. Help math problem i need a quick solver!!!
    By Dested in forum General
    Replies: 44
    Last Post: 05-21-2009, 10:58 PM
  4. Kid dials 911 for math problem
    By 1ightarr0 in forum General
    Replies: 1
    Last Post: 03-12-2008, 11:15 AM
  5. Hardest Math problem in the world
    By iverson954360 in forum General
    Replies: 10
    Last Post: 08-13-2007, 01:35 AM