51 ounces is not even half a gallon. (64 ounces). It is approximately 2/5 of a US gallon.
Approximately 1.125 gallons.
68 oz does not make 35 gallons. 68 oz. = 1/2 gallon plus 1/2 c (4 oz)
Assuming the oz. you refer to are weight, 40 lbs. would yield 160 gallons mixture.
That is 256 fl oz.
That is approximately 1.18 US gallons
That is 2.5 gallons
15.625 OZ
27136 oz
You need 0.6 fl oz for 1,700 gallons.
768 US fluid ounces = 6 US gallons
0.0625 US gallons.
1.6484375 US gallons