The answer is 5.3 kL.
Deci-means one-tenth of a unit and Kilo means 1,000 units
The unit we are talking about here is liter. So combining the terms we would have:
1 liter = 10 deciliters
1 kiloliter =1,000L
So taking this into account, we can convert 53,000 dL into kL:

x

x

= 5.3kL
So there are 5.3kL in 53,000dL