Prior to metrication, wool weight was measured in units like cloves and stones. If 1 sack = 2 weys, 1 wey = 6 1½ tod, 4 tod = 2 stones, 2 cloves = 3 stone, and 1 clove = 10 kilograms, answer the following:
how many stones do you have if you have 4 wey?
