geometry
posted by mike .
how many gallons of water will a tank measuring 66 inches in diameter and 24 inches in height,hold?

Since the data are in inches, I assume the answer would be in Americal gallons that is equivalent to about 3.8 litres.(as opposed to the Imperial gallon, about 4.54 litres).
Vomume = πd²h/4
=π(66)²*24/4
=26136π in³
Since 1000 cubic inches equal 4.329 US gal(liq.),
the box will hold
26136π/1000*4.329 gal
approx. 355 gal.