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Math Help - How to make 'T' the subject?

  1. #1
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    How to make 'T' the subject?

    Hello

    Can anyone help with the rearrangement of this formula to make 'T' the subject?

    ((Tx1-1)x58)+((-1)x(100-58)) = 7.88

    Whenever I try I get the wrong answer. I must be pretty stupid as I am sure this is probably quite basic GCSE level maths. Thanks in advance.

    Dan Wright
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  2. #2
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    ((Tx1-1)x58)+((-1)x(100-58)) = 7.88

    I think you may be missing brackets in the first section.. i think you could maybe interpret this a number of ways......

    Maybe..

    ( 58(T - 1) ) + (-1 x 42 ) = 7.88

    58T - 58 - 42 = 7.88

    58T - 100 = 7.88

    58T = 107.88

    T = 107.88 / 58

    T = 1.86
    Last edited by Joel; September 8th 2009 at 04:39 AM. Reason: error with negative number
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  3. #3
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    Thanks for you help Joel. In this formula, 'T' should actually = 1.86. I have taken the formula from my Microsoft Excel spreadsheet and the formula works fine to calculate 7.88 when 'T' = 1.86. Maybe in Excel brackets work slightly differently, I am not sure.

    Basically 'T' needs to = 1.86 and is separate from the 1 value.

    Any ideas? Thanks.

    Dan
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  4. #4
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    Simple error with my subtraction Dan. Error fixed
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  5. #5
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    Oh yes, thanks very much for your help. Saved me a lot of problems.

    Dan
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