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Math Help - Figure out the decimal amount

  1. #1
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    Figure out the decimal amount

    Say you have a bunch of numbers which have decimal amounts attached, like 43.75, but you don't know what the decimal amount is, so the number is displayed as 43.

    Try to figure out what the difference is between the following numbers, and what the decimal value of the first number is. The difference between each number is the same for all of the numbers.

    43, 45, 47, 48, 50, 52, 53, 55, 57, 59, 60, 62, 64, 65, 67, 69, 70, 72, 74, 76, 77, 79, 81, 82, 84, 86, 87, 89, 91, 93, 94, 96, 98, 99, 101, 103, 104, 106, 108, 110, 111, 113, 115, 116, 118, 120, 121, 123, 125, 127, 128, 130, 132, 133, 135, 137, 138, 140, 142, 144, 145, 147, 149, 150, 152, 154, 155, 157, 159, 161, 162, 164, 166, 167, 169, 171, 172, 174, 176, 178, 179, 181, 183, 184, 186, 188, 189, 191, 193, 195, 196, 198, 200, 201, 203, 205, 206, 208, 210, 212
    Last edited by Jerick; September 29th 2009 at 05:22 PM.
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  2. #2
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    Difference = 1.75

    43.5 45.25 47 48.75 50.5 52.25 .....
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  3. #3
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    Almost. The numbers don't round, the decimal just isn't displayed.
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  4. #4
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    Found 13 possibilities:

    1st number: 43.61 or 43.62 or 43,63 : difference = 1.71
    1st number: 43.70 to 43.79 : difference = 1.70
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  5. #5
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    ding ding ding...

    I should've posted a larger sample

    43, 45, 47, 48, 50, 52, 53, 55, 57, 59, 60, 62, 64, 65, 67, 69, 70, 72, 74, 76, 77, 79, 81, 82, 84, 86, 87, 89, 91, 93, 94, 96, 98, 99, 101, 103, 104, 106, 108, 110, 111, 113, 115, 116, 118, 120, 121, 123, 125, 127, 128, 130, 132, 133, 135, 137, 138, 140, 142, 144, 145, 147, 149, 150, 152, 154, 155, 157, 159, 161, 162, 164, 166, 167, 169, 171, 172, 174, 176, 178, 179, 181, 183, 184, 186, 188, 189, 191, 193, 195, 196, 198, 200, 201, 203, 205, 206, 208, 210, 212


    Which means 43.7 with a difference of 1.7 is correct.
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  6. #6
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    Quote Originally Posted by Jerick View Post
    Which means 43.7 with a difference of 1.7 is correct.
    Allelluya!!
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