Math olympiad

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A machine is set to give out one number less than twice the number fed into it. A number is fed into the machine. the result is fed back into the machine. The second result is 53. What number was first fed into the machine?

  • Math olympiad -

    Do it backwards.
    The second number bed in was (53+1)/2 =27. The first was (27+1)/2 = 14

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