It doesn't. One avoirdupois pound equals 16 avoirdupois ounces. One troy pound equals 12 troy ounces.
If the system is not named, avoirdupois is implied because it is more common. Therefore we always say 'there are 16 ounces per pound'.
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0.75 or 3/4 lb. One pound equals to 16 ounces and one ounce equals 0.06 of a pound. Also this relates only to solid (weight) ounces. There are two different kinds of ounces, ounces of weight/mass and ounces of volume (fluid). This can change when you are using the ounces to measure a non-liquid such as flour or sugar since the weight of dry items is not the same as their volume. An ounce of volume is called a "fluid ounce."
There are 28 ounces in one pound. Therefore, 1 pound 12 ounces is equivalent to 28 + 12 = 40 ounces.
There are 12 troy ounces in one troy pound.
There are 12 1/4 ounces in three pounds.
One troy pound is 13.16571 avoirdupois ounces or 12 troy ounces.
12 ounces.
== == There are 16 ounces in a pound.