**Hint:** It is a simple problem, and subtract 3.75 KL from 9.5 KL we will get the answer. The capacity of the container is how much water can be filled in the container. Eventually, it’s the maximum amount of water which can be filled and subtraction I needed because we want to remove the amount of water which is already present in the container.

**Complete step by step solution:** Given that the capacity of an empty container = 9 KL + 500L

1 kilo liters = 1000L

Total capacity of that empty tank = 9000L+500L = 9500L.= 9.5KL

Water level to be observed = 3KL and 750L

= 3KL = 3000L

So, the total water level observed is 3750L

= 3.75KL

Amount of water that can be filled is

9.5KL-3.75KL

= 5.75KL

= 5750 Liters

**Therefore the amount of water that can be filled = 5750L or 5.75KL**

**Note:** In this type of question, normal subtraction, additional conversion of kiloliters into litres is needed. The subtrahend is the number that is subtracted and it must be the smaller number. Subtraction is an important tool we use to help us find out what is left when taking one number away from another. For example, if Lauren has 23 and spends 12 on a new shirt, we can use subtraction to find out how much money Lauren has left.