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In the US there are wet and dry measurements, no matter which there will always be 4 quarts in a gallon. Think of it like a dollar;-

there are 4 quarters in a dollar, 

there are 4 quarts in a gallon.

There is a hint in the name quart which is short for quarter (the quart word base is from latin quartus meaning fourth) so 4 quarters make 1

Therefore there are 4 quarts in a gallon. ! that's it done....

So they use this to also measure dry goods, an example of this is apples - two dry gallons make a peck - in the stores you can buy apples in 1/2 peck bags so when you buy 1/2 a peck of apples it is a Dry gallon or Four quarts. !

So a 1/2 peck of apples is the same as 4 quarts or 1 gallon or 8 pints or 268.8 cubic inches.

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