Verified answer

Answer:

The volume of the tank is:

V = l x w x h = 45cm x 15cm x 20cm = 13500 cm^3

To fill the tank 2/3 full, we need to fill it with 2/3 of its volume, which is:

2/3 x 13500 cm^3 = 9000 cm^3

So, we need to add 9000 - V cm^3 of water to the tank to make it 2/3 full. Since the tank is already full, we need to remove V - 9000 cm^3 of water from the tank.

The volume of water to be removed from the tank is:

V - 9000 cm^3 = 13500 cm^3 - 9000 cm^3 = 4500 cm^3

Therefore, we need to remove 4500 cm^3 of water from the tank to make it 2/3 full.

Answer:

9000 cubic cm of water

Step-by-step explanation:

The volume of the rectangular tank is given by:

V = l x w x h

Where l is the length, w is the width, and h is the height.

Substituting the given values, we have:

V = 45 cm x 15 cm x 20 cm = 13500 cubic cm

To make the tank 2/3 full, we need to find 2/3 of the tank's volume:

2/3 x 13500 = 9000 cubic cm

So we need 9000 cubic cm of water to make the tank 2/3 full.