Math (fibonacci

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A sequence of numbers is called a Fibonacci-type sequence if each number (after for the first two) is the sum of the two numbers which precede it. For example, 1, 1, 2, 3, 5, 8 ... is a Fibonacci- type sequence. If 1985, x, y, 200 are four consecutive terms in a Fibonacci-type sequence, then x equals...

I don't know what they want. Please help.

  • Math (fibonacci -

    y = 1985 + x
    200 = x + y

    so

    200 = x + (1985+x)

    back to you :)

  • Math (fibonacci -

    By the way I suspect you mean 2000 not 200

  • Math (fibonacci -

    y = 1985+x
    200 = x+y
    Eliminate y and we have

    1985+x = 200-x
    2x = -1785
    x = -892.5

    and the numbers are

    1985, -892.5, 1092.5, 200

  • Math (fibonacci -

    It would help if that last date were odd :)

  • Math (fibonacci -

    It is 2000. But thanks!

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