It means 2 or an item.
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The quantity of two numbers is the product of the two numbers. Just multiply them together. The answer is the quantity of the two numbers.
A linear relationship
That's basically what rate means - a comparison of two proportional quantities.
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An even number is always some quantity of 'twos' (2's), and any quantity of twos is an even number. The first even number is a quantity of twos, and the second even number is another quantity of twos. When you add the first quantity of twos to the second quantity of twos, you get a new quantity of twos. Since the new quantity of twos is a quantity of twos, it's an even number.