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Math Help - numerical reasoning question I can't work out

  1. #1
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    numerical reasoning question I can't work out

    Hi

    I have a question which asks to identify the missing number as follows:

    __________
    | 7 | 8 |
    | 5 | 6 |
    |------------

    _________
    | 20 | 1 |
    | 2 | ? |
    --------------

    possible answers are: 3 or 16 or 25 or 48 or 17.

    I didn't draw it but the sets of four numbers above are in square girds - hope that makes sense. The others of this type I could work out fairly easily, it is just this problem. What is the ? and why?

    Angus
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  2. #2
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    7 + 8 + 5 + 6 = 26
    20 + 1 + 2 + 3 = 26

    Well?!
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  3. #3
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    Hm, that's a tough one. The only thing I see here is that, maybe it rolls over back to 1 after 20. In the original, you have, on one row, 7 and 8. Second row, 5 and 6. It increases by 1. But in the second grid, we see 20 and 1, perhaps meaning to roll over to 1 after 20. So I would guess the answer to be 3 (i.e. 2 and 3 in the bottom row of the second grid).

    It does have the virtue of being one of the possible answers, anyways, and it does have a consistent logic.
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  4. #4
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    Ah, didn't notice that. But still, I reckon a tough one.
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