A pool in the shape of a rectangle prism - 10m x25mx 2m

How many liters of water are needed to completely fill the pool

Just find the volume with the dimensions given. 10x25x2 = 500m^3

Once you find that, turn that into cm^3 because it'll be easier.

1m^3 = 1000,000cm^3

500m^3 = 125,000,000c m^3

Since cm^3 can be ml, convert that into litres

1000ml = 1L

125,000,000 = 125,000L