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Puzzle of the Day

These puzzles are also printed in Eight days a week, a booklet published by the Association of Teachers of Mathematics.The Association of Teachers of Mathematics

On average you inhale about 0.6 of a litre of air in one breath (that's about a pint). Estimate how much air you breathe in a year.

Answer: 10 per min is over 3 million litres, over 5 million pints


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