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Math Help - can you use 5,6,7and9 to make 24?

  1. #1
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    can you use 5,6,7and9 to make 24?

    you can use x,+,- and division and you can only use the numbers once
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by kc0404 View Post
    you can use x,+,- and division and you can only use the numbers once
    (5 + 7)(9 - 7) = 24
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  3. #3
    ixo
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    Wink

    Quote Originally Posted by Jhevon View Post
    (5 + 7)(9 - 7) = 24
    Can only use the numbers once
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by ixo View Post
    Can only use the numbers once
    haha, thanks. somehow in my head i thought i had used the 6 instead of an extra 7
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  5. #5
    ixo
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    There are 1680 possible combinations, alot of them don't work out. I don't know the answer just letting you know the probability of solving randomly.
    Last edited by ixo; February 8th 2009 at 06:38 AM.
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  6. #6
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    (7-5)*9+6=24
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  7. #7
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    thanks

    my teacher gave the answer today
    she said:
    (7-5)x9+6
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  8. #8
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    Well, my answer is correct. By the way, is this high school math? It seems to be too easy. I have been playing this kind of games since primary school. It is a very good practice to calculate fast. If you not get use to it, you can try practice it, enables you to twist your brain faster. Like see the car plat number, then you can start think how to make the number becomes 24. Of course, not every 4 digit number will eventually get you to 24. more numbers will do.

    Well, let's test. Try to make 9,6, 8, and 2 becomes 24.
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  9. #9
    ixo
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    wrong.. hit post before checked
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  10. #10
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    What do you mean with wrong?
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  11. #11
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    24=(6*2-9)*8
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  12. #12
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    Well, your answer is correct. But there is one more way to make it 24.
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  13. #13
    Like a stone-audioslave ADARSH's Avatar
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    ixo:wrong.. hit post before checked
    He must have posted something wrong, not you it has nothing to do with your post


     <br />
24 = 8*3 = 8*\frac{9}{ \frac{6}{2}} <br />
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  14. #14
    ixo
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    Quote Originally Posted by ADARSH View Post


    ixo:wrong.. hit post before checked
    He must have posted something wrong, not you it has nothing to do with your post


     <br />
24 = 8*3 = 8*\frac{9}{ \frac{6}{2}} <br />

    ya i just did a quick estimation then hit post.. realized it was wrong and didn't feel like getting a correct equation for it.
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