Look it up
Mass = Volume x Density and you are given Density, so all you need is Volume.
Volume of the tank = Height x Width x Length, all of which you are given. The only challenge (and it is an annoying one, worthy of no effort), is to convert all the units given to similar units so you can do the math.
If you look up alll the terms in a dictionary (or online at
Webster's Dictionary) you will find all the conversions for those units. I for one am not going to bother.
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