Newspaper article Evening Chronicle (Newcastle, England)

DEAR Dr Maths, at School [...]

Newspaper article Evening Chronicle (Newcastle, England)

DEAR Dr Maths, at School [...]

Article excerpt

Byline: Steve Humble

DEAR Dr Maths, At school my teacher gave us a puzzle to work out.

If you were given pocket money of 1p the first week, then 2p the second week, 4p the third week, 8p the fourth and so on, doubling up each week, how long would it be before you have saved pounds 1m? Adam. Thank you very much for sharing this puzzle, it is one of those which has an answer you just cannot believe.

It would only take 27 weeks for you to save up your pocket money and become a millionaire.

Amazing! The reason is down to the last few weeks' pocket money. When you keep doubling the totals they start to give very big answers, see picture one.

Here is a puzzle for you to try, see picture two.

The average distance from the Earth to the moon is 384,400km or 384,400,000,000mm and a 1p coin has a thickness of about 1. …

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