If poured evenly (and exact) there would be 1/4 litre (250 mL) in each cup, or 8.45 fluid ounces in each glass.
12
Depends on the size of the glass. A liter of water is about 33.8 ounces. A "regular" glass might be about 8 ounces. That's 4 glasses and a little dribble extra in each one. For 4 liters, that's about 16 glasses each containing 8 ounces and a little dribble more.
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5
The answer will depend on how big each glass is and they can very greatly in size.
2.5 litres ÷ 250 litres = 0.01 (Those are some extremely large glasses: 250 litres ≈ 55 gallons each!)
the sound each glass makes
The standard drinking glass in the US holds 16 fluid ounces, which is one pint. Two glasses would therefore be equal to one quart, and one quart is approximately (though not exactly) equal to one liter. So, 20 glasses would hold roughly 10 liters of milk.
In one liter there are 4 glass of water therefore in 1.5 that is one and a half liter there are 6 glass of water.
the sound each glass makes
you can get 10 half liter glasses of beer from 5 liters. There are about 2.2 pints to a liter so the 10 glasses will each hold 1.1 pints.
That really depends on the size of the glass, but typically, each liter may be equal to 4 or 5 glasses.