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Math Help - I am sure there is an easy answer!!

  1. #1
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    I am sure there is an easy answer!!

    insert brackets, + or - between the following digits: 2,3,4,5,6,7 to arrive at an answer of 20
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  2. #2
    MHF Contributor kalagota's Avatar
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    Quote Originally Posted by stevej63 View Post
    insert brackets, + or - between the following digits: 2, -3,-4,+5,+6,+7 to arrive at an answer of 20
    also, we can have -2+3+4-5+6+7

    notice that the sum of the digits is 27..
    you have to subtract a total of 7..
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  3. #3
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    Thanks but???

    Hi kalagota

    Doesn't your solution give an answer of 13, as you have taken off 7 aswell as not adding it on
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  4. #4
    MHF Contributor kalagota's Avatar
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    Quote Originally Posted by stevej63 View Post
    Hi kalagota

    Doesn't your solution give an answer of 13, as you have taken off 7 aswell as not adding it on
    huh? i said that 2+3+4+5+6+7 = 27..

    so, what two numbers gives a sum of 7?
    a) 3 and 4
    b) 2 and 5

    so, put the negative signs before them..
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  5. #5
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    obviously im confused

    I need to acheive an answer of 20, not 27. Using the 2, -3,-4,+5,+6,+7 or the other solution -2+3+4-5+6+7, I get an answer of 13, where am I going wrong???
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  6. #6
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    (2)(3)(4)-5-6+7=20 where (2)(3)=6
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  7. #7
    MHF Contributor kalagota's Avatar
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    Quote Originally Posted by stevej63 View Post
    I need to acheive an answer of 20, not 27. Using the 2, -3,-4,+5,+6,+7 or the other solution -2+3+4-5+6+7, I get an answer of 13, where am I going wrong???
    oh i see, my mistake...

    wait...

    (2)(3)(4)-5-6+7

    EDIT: didn't notice it has been solved..
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