Rolands suitcase has a mass of 2,500 dekagrams. How many kilograms is his suitcase?

A decagram is 10 grams, so first lets convert the decagrams to grams and then after we'll change to kilograms.

If 1 decagram equals 10 grams, then 2500 decagrams is equal to:

2500*10 = 25000 grams

Now, 1 kilogram equals 1000 grams so 25000 grams equals:

25000/1000 = 25 kg

therefore, 2500 decagrams equals 25 kg