Every time you buy a new chain, put the old one in a cornflakes packet. At the end of the year, count the number of cornflakes packets you have and divide this number by 52. This will give you the average number of chains you buy in a week.
@Balki started
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Every time you buy a new chain, put the old one in a cornflakes packet. At the end of the year, count the number of cornflakes packets you have and divide this number by 52. This will give you the average number of chains you buy in a week.