Problem 44750. You never ask a lady her age

Instead you ask her to multiply her age by 10, then subtract any of the first nine multiples of 9 (9,18,...,81), and tell you the result. Based on this number N, find the lady's age.

Example: input N=384, output a=42. Indeed, 42*10 - 36 = 384.

The function is not injective, the same output age a corresponds to multiple input values N.

Solve

Solution Stats

69.64% Correct | 30.36% Incorrect
Last Solution submitted on Jun 27, 2025

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