A 5-gallon jug contains 20 quarts. A fluid quart is equivalent to one-fourth of a gallon by definition; a gallon contains four quarts.
5 gallons equals 5 multiplied by 4 quarts, or 20 quarts, using these equalities. The dry quart differs from the fluid quart. The dry quart, for example, equals 1.10 litres, while the fluid quart equals 0.95 litres. The two units of measurement, however, are identical in that 1 dry gallon equals 4 dry quarts, and 1 fluid gallon equals 4 fluid quarts.
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