Math olympiad
posted by Janice
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?

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