The easiest way to do this sum is to convert all of the quantities to the same units. Pints would be best. There are 2 pints in a quart and there are 8 pints in a gallon. This means that the sum becomes 52 pints - 7 pints. The answer is obviously 45 pints. You can now convert this back into gallons, quarts and pints. 45 pints is 5 gallons (40 pints) plus 2 quarts (4 pints) and 1 pint. So the whole sum would be...
6 gal + 2 qt - 3 qt + 1 pt = 5 gal + 2 qt + 1 pt.
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It is not possible to subtract more from less.
22
(10 gal 1 qt) x 2 = 20 gal 2 qt = 20.5 gal
no. 2 gal = 8 qt. 1 gal is equivalent to 4 qt.