Solar system, galaxy, universe is the answer that is ordered from smallest to largest. Our solar system belongs in the Milky Way Galaxy which belongs in the universe. The universe contains many galaxies, one of which being the Milky Way.

This is a word problem that the reader must determine whether the numbers should be added, subtracted, multiplied or divided. First, we must read the word problem and look at the numbers. There are a total of 225 boxes and there are at most 9 boxes in each crate. So, you could fill each crate with nine boxes.

As you are loading you may count the number of crates as you load them onto the truck. After you load all of the boxes into the crates and load the crates onto the truck, you will notice that you have 25 crates on the truck. You would have to divide 225 boxes by the 9 boxes in each crate. The answer would be 25.