Here's how we get that:
* One stone is equal to 14 pounds.
* 12 stones are equal to 12 x 14 = 168 pounds.
* Half a stone is equal to 14 / 2 = 7 pounds.
* Therefore, 12 and a half stone is equal to 168 + 7 = 175 pounds.
It's important to note that this conversion is specific to the Imperial system of measurement.
