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Thread: 7 Math problems I just can't do

  1. #26
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    Quote Originally Posted by DeiJaiVui View Post
    5 8 12 17 23

    each interval add the next one

    so the next number would be +30

    69+30 = 99
    I don't understand, can you explain it differently? :P

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    Quote Originally Posted by bi a op View Post
    I don't understand, can you explain it differently? :P
    here you go buddy.


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    May I ask you what year you are in or grade for the Americans?

  4. #29
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    Quote Originally Posted by DeiJaiVui View Post
    I see! Thanks

    Quote Originally Posted by Mr[S] View Post
    May I ask you what year you are in or grade for the Americans?
    If you're asking me. It would be Senior High, 12th grade. I'm 17.

    Let's hope tomorrows problem will be more challenging.

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    Quote Originally Posted by bi a op View Post
    I see! Thanks



    If you're asking me. It would be Senior High, 12th grade. I'm 17.

    Let's hope tomorrows problem will be more challenging.
    Lol.. I'm in Grade 7, Australia. xD

  6. #31
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    This is already answered and such, but in hopes of not having the confusion we had with yesterdays i will attempt to explain it. Basically... You look at the difference in each term and their differences until you come to a constant number.

  7. #32
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    There's a new problem.

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    10 I assume.

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    The Adams family have eaten pancakes. There is 1 liter of the liquid pancake mix stuff left. The mother is going to freeze it. The mother knows it takes exactly 5 scoops to fill the box she is putting it in. But she can't find the scoop, so she uses a smaller scoop. This scoop is half the size of the first one that she couldn't find. Both scoops are half-sphere shaped.
    How many scoops would the mother need to fill the box?
    Yeah, trick question though? I'd assume it would be 10 too..
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    lol at the answers

    Assuming that the Scoop is a perfect half sphere

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    For enslaved.

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    damn, I am never first. At least I am most readable :P

    edit:

    Also made a mistake swapping the 4 and 3, oh well. Answer is correct.
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    The main part its (r/2)^3 which makes the difference to be 8x r' the front part doesn't matter as it is constant in both

  14. #39
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    @ masterbb, what did you type that up in? Mathematica?

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    Quote Originally Posted by Enslaved View Post
    @ masterbb, what did you type that up in? Mathematica?
    word(file attached)

    Press left alt and (+=) to insert formula.
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    Quote Originally Posted by Enslaved View Post
    lol at the answers

    Assuming that the Scoop is a perfect half sphere
    http://i.imgur.com/ywWN1.png
    Wow, that's pretty neat. I was 1 hour too late to answer that days question so I emailed the admin with my answer. He accepted the answer because it was correct. This is genious

    Also, there's a new problem.

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    Last edited by masterBB; 12-15-2012 at 04:31 PM.
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  18. #43
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    New problem. 15th can still be answered.

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    was my previous answer not correct?
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    Quote Originally Posted by bi a op View Post
    New problem. 15th can still be answered.
    You meant qns 16?
    I get the same ans as masterBB for 15, though a much shorter way
    fill rate = 1 bathtub per 15 min (1/15)
    fill rate - drain rate = 1 bathtub per 60 min (1/60)
    drain rate = 1/15 - 1/60 = 1/20 (1 tub / 20min)
    time needed to drain 1 bathtub = 20min


    For qns 16, what 'cone' are you referring to? The bathtub is a cone?
    Last edited by riwu; 12-16-2012 at 01:13 PM.

  21. #46
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    Quote Originally Posted by riwu View Post
    You meant qns 16?
    I get the same ans as masterBB for 15, though a much shorter way
    fill rate = 1 bathtub per 15 min (1/15)
    fill rate - drain rate = 1 bathtub per 60 min (1/60)
    drain rate = 1/15 - 1/60 = 1/20 (1 tub / 20min)
    time needed to drain 1 bathtub = 20min


    For qns 16, what 'cone' are you referring to? The bathtub is a cone?
    I do it like in one step in my head. But I try to explain it as much detail as possible. Most steps dont do anything.
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    the height of the water level is variable to the radius of the cone

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    Quote Originally Posted by bi a op View Post
    16th
    We fill half the cone's volume with water, which is upsidedown where height = 1.
    What is the height of the water?
    Im confused on this one... What is the height of the water if the cone is turned the other way? ( like this -- /\ ) or is it meant to say what is the height of the cone?

    Either way, height of the water if the cone is flipped around = sqrt2 -1 ~ .41 units
    Height of the cone = sqrt2 ~ 1.41 units

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    Quote Originally Posted by Enslaved View Post
    lol at the answers

    Assuming that the Scoop is a perfect half sphere
    Quote Originally Posted by Turpinator View Post
    Im confused on this one... What is the height of the water if the cone is turned the other way? ( like this -- /\ ) or is it meant to say what is the height of the cone?

    Either way, height of the water if the cone is flipped around = sqrt2 -1 ~ .41 units
    Height of the cone = sqrt2 ~ 1.41 units
    Quote Originally Posted by Enslaved View Post
    the height of the water level is variable to the radius of the cone
    You're all correct, look at answer D


    New problem for 17th!
    Last edited by slackeru; 12-17-2012 at 12:45 PM.

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