What is quantity and how do you use it.
A quantity is how much you have of a particular quality or substance. You can use it to compare to other quantities to see if they are more or less. Depending on what you desire — more or less — you might adjust the situation to revise your quantity.
Mileage is a quantity — miles per gallon. If you desire greater mileage, you can use gas additives, change engines, modify your driving methods am ong other changes.
I hope this helps. Thanks for asking.
Quantity is how much of something we are discussing or which we have. For example, the quantity might be a bushel of apples or 10 feet of lumber or 15 gallons of gasoline.