This rectangular tank is filled with water to a height of 4 centimeters. How much more water is needed to fill the tank completely? the width is 18 cm, length 12 cm, and height 6 cm.

so calculate the Volume of the water that is already in the tank

so l x w x h

4 x 18 x 12

=864cm^3 is in the tank

find the total volume of the tank:

6 x 18 x 12

=1296cm^3

and subtract the current from the total to find what you need:

1296cm^3 - 864cm^3

= 432 cm^3

you can also find how much you need by using the remaining 2cm from the height (6-4=2) and use the volume formula with 2 substituted as the height and you'll get the same answer