to be for real i truly don't know but first you need to make the units the same and that's called renaming the you subtract
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It depends on what you consider to be "customary" and what you wish to convert them to.
In the SI system (metric), length is a meter, mass is the kilogram, and time is the second.
A Customary Unit or non-SI unit is a measurement unit that is not part of the metric system. Customary units are mainly units of the Imperial system but they could be localised customary units - such as Gaj (for area) is South Asia.
SI units is what we use in the United States for the common unit of measurement for matter.
Usually people use the metric system, some (like people of the United States) use the English system.