Think about your units. They will save you.

By multiplying the two given values, your units are . Does that look like volume to you?

If you divide the mass by the density, you get . Does that look like volume?

Additionally, you should seek clarity from the definitions. What is the definition of density? Find it in your book. Mass/Volume? Something like that? Well, if you have Density = Mass/Volume and you are given Mass and Density, you are left with only a small algebra problem. Substitute and solve.

Note: Make sure you know the difference between Weight and Mass. They are NOT the same thing.