Answer:
The tank is currently 40% (40 percent) full.
Explanation:
We can find this by dividing the current fullness (648 gal) by the full tank (1620 gal).
648 / 1620 = 0.4
0.4 = 40%
How do we know to divide 648 by 1620 and not the other way around?
We know this because that we want to know what percent of the full tank is currently full. It's something that you just need to get used to, once you do enough of these types of problems, I'm sure you'll get the hang of it!
Hope I could help you! If I did, it would mean a lot of you could give braniest or even just a thanks :) If I didn't quite answer your question, please let me know and I'll try my best to assist you!