Chapter 6

M: Took me while, but I got there. Now, can you tell what time it is?

The image above contains a hidden question. Please enter your answer to the question in the box below. If the answer is a number please enter it using numerals rather than words.

To deter guessing without thinking, we ask that you also solve the following simple arithmetic problem before checking your answer:

If x = 6, y = 6 and z = 8, what is x × y - z?

This problem was first solved on Mon 10th March at 6:30:28pm

Alan Turing Cryptography Competition 2025 is organised by the The Department of Mathematics at The University of Manchester.
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