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by Brian Gladman on June 25, 2017

Sunday Times Teaser 2857 – Significant Errors

by Danny Roth

Published June 25 2017 (link)

Last year George and Martha were going to visit one of their daughters. Her house number was a two-figure number but unfortunately Martha wrote the number incorrectly by making the first digit less than it should be. When George discovered the error he commented that the incorrect number was a whole number percentage of the correct one. If you knew that percentage then you should be able to work out their daughter’s house number.

Then the daughter moved to a different two-figure house number, Martha again wrote the number incorrectly by making the first digit less than it should be, and again the incorrect number was a whole number percentage of the correct one. If you knew that percentage then you should be able to work out their daughter’s new house number.

What was the daughter’s original house number, and what is the new one?

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