mathematical association 2009.pdf · 24 25 primary mathematics challenge 2009 on average a person...

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Page 1: Mathematical Association 2009.pdf · 24 25 Primary Mathematics Challenge 2009 On average a person visits the toilet 2500 times a year. Older toilets use 9 litres of water per flush
Page 2: Mathematical Association 2009.pdf · 24 25 Primary Mathematics Challenge 2009 On average a person visits the toilet 2500 times a year. Older toilets use 9 litres of water per flush