Missing one more dimension
The volume of such a room is 480 cubic feet.
You need three [orthogonal] measures to determine volume. Youhave provided height and width but not the depth. So the question cannot be answered.
You measure the length, height and depth of the INSIDE of the fridge compartment, then multiply all three numbers together... For example MY fridge measures 17 x 19 x 28 inches internally - this is 9044 cubic inches. NOW - divide that figure by one cubic foot (1728in3) which gives the capacity as 5.23ft3
8640ubic feet
This room is a rectangular prism. The equation for a rectangular prism to find the volume is the LxWxH=V. 50x28x15=1400x15=21000 cubic feet The number of cubic feet in this room is 21000 cubic feet.
The volume is 36*68*31 = 75,888 cubic inches = 75,888 / (12*12*12) = 43.91667 cubic feet.
= (65/12) x (35/12) x (350/12) cubic feet
You measure the INTERNAL depth, height and width - then multiply everything together to get its capacity. For example suppose your fridge measures 24inches deep, 24 inches wide and 30 inches high - That is 17280 cubic inches or 10 cubic feet.
The refrigerator is (68/12)' x (30/12)' x (30/12) ft = 35.42 cubic feet. However, the quoted capacity will be the internal volume, not the outside.
In feet it measures 5 and a half by 3 by 2 and a third. For simplicity this can be written as 11/2 x 3 x 7/3 = 231/6 = 38 and a half cubic feet
Perhaps what is meant is a cubic yard where the wood pile or block measures 3 feet wide, 3 feet long, and three feet high.
If the container is 3ft x 3ft x 9ft, the answer is 81 cubic ft. There are approximately 607.5 gallons of water.