50 ml = 50 cubic centimeters
0.5 of a decilitre is 50ml. 50ml of water is approximately 10 teaspoons. It's easier just to think in mland litres. Those "in between terms " like 'deci' and 'centi' are just confusing.
20 x 50 ml in a kilo of water.
50mL is 5cL (0.1 centiliters per milliliter).
20,000 50ml is a measure of volume. 1 ton is a measure of mass. Your question can only be answered once you specify the density of the matter that occupies the 50ml of volume. There was no mention of water being the matter in question.
Since 1.5litres is 1,500 mL , dividing this by 50mL means there would be 30 bottles.
50mL = 1.6907 fluid ounces.
50mL = 1.7 (1.6907) fluid oz.
50ml = 1.76oz (UK) 50ml = 1.69oz (US)
50mL = 1.6907 fluid oz
50mL = 1.6907 fl oz
10
50mL is 5cL