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by Brian Gladman on November 10, 2018

Sunday Times Teaser 2929 – My Pin Numbers

by Graham Smithers

Published November 11 2018 (link)

Using all but one of the digits 0 to 9, and systematically replacing them by a letter, my pin numbers become ONE, TWO, FIVE and SEVEN.

These numbers are such that:

ONE is odd

TWO is even

FIVE is odd and divisible by 5

SEVEN is divisible by 7

ONE + TWO + TWO = FIVE

If I told you which digit was not used, you should be able to work out my pin numbers.

What pin number is represented by SEVEN?

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