You have a cylindrical oil tank 190 ft across on the inside and 80 ft high its now filled with 75% oil. You calculated that it contains 35,800 cubic feet of oil

Question

Is this correct?

Answer 1

The volume of a cylinder is : radius x height
Since the tank is 190 ft across, the diameter of the top, radius is half that, 95 ft.

So the volume is: 95 ft *  80 ft = 2269142.857142855 cubic feet
If it is 75% full of oil, then the volume of the oil is 0.75 x 2269142.857142855 = 1,701,857 cubic feet, which is not the answer that you gave, so no, you are not correct.

Answer 2

The volume of a cylinder is : (pi * radius ^2 ) * height

the tank is 190ft across, which is the diameter of the top, so the radius is half that, 95ft.

 

So the volume is: pi * 90 * 90 * 80 = 2,035,750 cubic feet

If it is 75% full of oil, then the volume of the oil is 0.75*2,035,750 = 1,526,812.5, which is not the answer that you gave, so no, you are not correct.