25 teaspoons (US) = 4.2 fluid ounces (US)
There are approximately 150 teaspoons in 25 ounces.
2.5 US fluid ounces = 15 US teaspoons
25 mL is about 0.845 US fluid ounces.
No 1.5 teaspoons equal .25 ounces.
2.5 gallons is 320 fluid ounces.
A US tablespoon = 1/2 fl. oz. Therefore, half a tablespoon would be 1/4 fl. oz.
2.5 US quarts = 80 US fluid ounces
800 fluid ounces is 25 quarts.
25 ml = 0.845 US fluid ounces.
That is 25 cups.
25 US fluid ounces = 739.34 mL
In liquid measure, 1 oz. equals 6 teaspoons. At that rate, 1 1/2 ounces equals 9 teaspoons. In dry measure, there are about 5 grams per 1 teaspoon of flour. (Don't expect the same conversion for, say, long grain rice, but it will be in the neighborhood.) At that rate, there will be right at about 8 1/2 teaspoons for 1 1/2 ounces of dry (flour) measure.