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Bored - some easy maths brain teasers for you.

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paulthebuilder
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2009/07/27 15:14:04 (permalink)
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Bored - some easy maths brain teasers for you.

If n is an odd integer, which of the following is even?

1) 5n + 2
2) n/4
3) 2n + 3
4) n(n + 3)
5) nn



When the integer n is divided by 2, the quotient is u and the remainder is 1. When the integer n is divided by 5, the quotient is v and the remainder is 3. Which one of the following must be true

1) 2u + 5v = 4
2) 2u - 5v = 2
3) 4u + 5v = 2
4) 4u - 5v = 2
5) 3u - 5v = 2



If a, b, and c are consecutive integers and a < b < c, which of the following must be true?
1) b - c = 1
2) abc/3 is an integer.
3) a + b + c is even.



In the figure below, what is the value of x?


(A) 30
(B) 32
(C) 35
(D) 40
(E) 47
#1

97 Replies Related Threads

    CheekyChappie
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    Re:Bored - some easy maths brain teasers for you. 2009/07/27 16:29:29 (permalink)
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    n(n + 3)

    2u - 5v = 2

    abc/3 is an integer

    x=30
    #2
    Blue_Lagoon3000
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    Re:Bored - some easy maths brain teasers for you. 2009/07/27 16:48:03 (permalink)
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    You know like when you loose one of your mates to a religious cult...

    Well thats kind of whats happened to Righty with Maths lol

    #3
    sillynarbie
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    Re:Bored - some easy maths brain teasers for you. 2009/07/27 17:10:50 (permalink)
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    oops
    #4
    jacked_fibres
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    Re:Bored - some easy maths brain teasers for you. 2009/07/27 17:27:38 (permalink)
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    done 1,3 n 4 no probs

    2nd one i didn't really read enough or concentrate. If i had to sit down and do it, i would be able to i reckon.
    #5
    OTTO
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    Re:Bored - some easy maths brain teasers for you. 2009/07/27 17:30:37 (permalink)
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    #6
    CheekyChappie
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    Re:Bored - some easy maths brain teasers for you. 2009/07/27 17:39:42 (permalink)
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    You know like when you loose one of your mates to a religious cult... Well thats kind of whats happened to Righty with Maths lol


    Yep, he's well and truly joined us. Pretty soon we'll start pressing  him for donations and urging him to sever contact with his family.
    #7
    johnny bravo
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    Re:Bored - some easy maths brain teasers for you. 2009/07/27 17:55:15 (permalink)
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    you lost me at integer......

    "Knowledge is knowing that a tomato is a fruit.   Wisdom is knowing not to put it in a fruit salad"

      JIMMY'S GIMP
    #8
    *The_West*
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    Re:Bored - some easy maths brain teasers for you. 2009/07/27 18:06:02 (permalink)
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    my head hurts :(

    calm down, its life, mate, its only a game
    #9
    dementia
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    Re:Bored - some easy maths brain teasers for you. 2009/07/27 18:10:06 (permalink)
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    Life's journey is not to arrive at the grave safely in a well preserved body... but rather to skid in sideways, totally
    worn out, shouting
    Holy ****... What a ride!!"    
    #10
    jacked_fibres
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    Re:Bored - some easy maths brain teasers for you. 2009/07/27 18:11:33 (permalink)
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    1 and 3 can be done just by whacking the numbers in, everyone should be able to do them.

    2nd i haven't done. 4th is maybe a little more thinking, but a knowledge of Z angles makes it relatively easy.
    #11
    *The_West*
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    Re:Bored - some easy maths brain teasers for you. 2009/07/27 18:12:58 (permalink)
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    i was stoned most of the time in maths. i was lucky to scrape a c 
    if i took the test now, i hate to think what i would get!
    luckily enough, my career only requires me to do fairly basic mental arithmatic, none of this algebra/trig/pythag nonsense lololololol
    post edited by *The_West* - 2009/07/27 18:14:55

    calm down, its life, mate, its only a game
    #12
    jacked_fibres
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    Re:Bored - some easy maths brain teasers for you. 2009/07/27 18:16:04 (permalink)
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    integer is just a whole number like 1,2,3,4

    whack in some odd numbers and you'll get the answer to 1.

    do the same with 3 whacking in some consecutive numbers.

    Thats half marks there.
    #13
    CheekyChappie
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    Re:Bored - some easy maths brain teasers for you. 2009/07/27 18:40:08 (permalink)
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    2nd i haven't done. 4th is maybe a little more thinking, but a knowledge of Z angles makes it relatively easy.


    No Z-angles required, just angles in a triangle and angle on a straight line.
    #14
    H20
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    Re:Bored - some easy maths brain teasers for you. 2009/07/27 18:46:55 (permalink)
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    I agree with CheekyChappie (and also with anything else he says on this matter lol)

    I also think Blue Lagoon has a point aswell Righty lmao.

    Look after your body,it is the greatest thing you will EVER own----Bazil Baines

    Dodging the rain and bullets since 1966.
    #15
    jacked_fibres
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    Re:Bored - some easy maths brain teasers for you. 2009/07/27 19:38:19 (permalink)
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    CheekyChappie

    2nd i haven't done. 4th is maybe a little more thinking, but a knowledge of Z angles makes it relatively easy.


    No Z-angles required, just angles in a triangle and angle on a straight line.



    I used z angles.




    where the 2x+60 is wrote basically draw a line straight up to make it 90 degrees, making a Z angle. You can now subtract the x form 2x+60. So you now got x+60 in the 90 degree angle area, so 90=x+60 which making x clearly 30.

    Thats how i did it, clearly you know another way. Which i presume is this one.

    180=60+2x+(90-x)
    120=2x+(90-x)
    120-2x=90-x
    120-90=-x+2x
    30=x
    #16
    paulthebuilder
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    Re:Bored - some easy maths brain teasers for you. 2009/07/27 19:40:09 (permalink)
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    Sorry.
    I have no idea what has happened to me.
    #17
    tac
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    Re:Bored - some easy maths brain teasers for you. 2009/07/27 19:47:44 (permalink)
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    rightyho

    If n is an odd integer, which of the following is even?

    1) 5n + 2
    2) n/4
    3) 2n + 3
    4) n(n + 3)
    5) nn



    When the integer n is divided by 2, the quotient is u and the remainder is 1. When the integer n is divided by 5, the quotient is v and the remainder is 3. Which one of the following must be true

    1) 2u + 5v = 4
    2) 2u - 5v = 2
    3) 4u + 5v = 2
    4) 4u - 5v = 2
    5) 3u - 5v = 2



    If a, b, and c are consecutive integers and a < b < c, which of the following must be true?
    1) b - c = 1
    2) abc/3 is an integer.
    3) a + b + c is even.



    In the figure below, what is the value of x?


    (A) 30
    (B) 32
    (C) 35
    (D) 40
    (E) 47






    #18
    paulthebuilder
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    Re:Bored - some easy maths brain teasers for you. 2009/07/27 19:54:46 (permalink)
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    From: http://www.beanactuary....ExamPSamplequestions.pdf

    1. A survey of a group’s viewing habits over the last year revealed the following
    information:
    (i) 28% watched gymnastics
    (ii) 29% watched baseball
    (iii) 19% watched soccer
    (iv) 14% watched gymnastics and baseball
    (v) 12% watched baseball and soccer
    (vi) 10% watched gymnastics and soccer
    (vii) 8% watched all three sports.

    Calculate the percentage of the group that watched none of the three sports
    during the last year.
    #19
    paulthebuilder
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    Re:Bored - some easy maths brain teasers for you. 2009/07/27 19:55:28 (permalink)
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    tac
    I have comfortably got these.


    Indeed you have Mr Tac.
    #20
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