4.5 US gallons is 576 fluid ounces @128 ounces per gallon.
512 ounces in 4 gallons
512 oz
128 fl oz = 1 gallon 2 x 128 fl oz = 256 fl oz = 2 gallons 4 x 128 fl oz = 512 fl oz = 4 gallons
3/4 of a gallon
Divide 12oz and 16 gallons by 4 which equals 3oz and 4 gallons then divide your 4 gallons in half to get 2 gallons and also divide 3oz in half to get 1.5oz. The answer is 1.5oz will treat 2 gallons
Assuming the oz. you refer to are weight, 40 lbs. would yield 160 gallons mixture.
68 oz does not make 35 gallons. 68 oz. = 1/2 gallon plus 1/2 c (4 oz)
4 US gallons = 512 US fluid ounces
147.5 oz is equivalent to 1.15 gallons.
That is 2.5 gallons
15.625 OZ
27136 oz