We know that 1m=100cm
Dimension of the tank is 2m 75cm and 1m 80cm and 1m 40cm
Which can be written as 275cm × 180 cm × 140 cm
Also we know that volume of cuboid = length × breadth × height
V = 275 × 180 × 140
V = 6930000 cm3
And we know that 1000cm3= 1L
Therefore V=6930 liters of water it holds when filled to the brim.