You work at a swimming pool supply store and are taking inventory. There are 4 gallons and 1 quart of chlorine left on the shelf. How many quarts of chlorine are on the shelf?

There are 4 quarts in 1 gallon, so 4 gallons equal 4 × 4 = 16 quarts. Add the 1 quart already on the shelf: 16 + 1 = 17 quarts. The correct choice is 17.

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