The stone is an old English measure that used to vary depending on what was being weighed and where; meat, grain and various other products were sold in stones a very long time ago but the weight of a stone varied between typically 8lbs and 16lbs depending on what was being weighed and where.
These days stones are normally only used for people; 1 stone is 14lbs so 9st =126lbs and adding 5lbs makes 131lbs
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