An object has a mass of 615 grams and a volume of 105cm^3. What is the
density of the object?

musicfan,
If you were not fully satisfied, you could ask for clarification
before rating my answer. I don't understand why you were not fully
satisfied.

Rainbow~

Yes, I agree with the person who has answered. This answer can not be made better

And considering that their homework is being being answered for them.

It just boils down to something like this:

   Suppose you have a box, with edges each 1 foot long. So it's a box
with a volume of 1 x 1 x 1 = 1^3, or, 1 cubic foot (1 ft^3). Now
suppose you put in some marbles, and we're way out in space,
weightless, so the marbles can all float about inside the closed box
and spread out evenly. If I put in 1 marble, how many marbles per
cubic foot is that? It is, of course, 1 marble per cubic foot, or,
1/ft^3. That's the density of marbles, 1/ft^3.

   Now let's put in more marbles. Put 10 marbles into the same box.
What's the density? It's 10/ft^3. It has a density of 10 marbles per
cubic foot.

   But each marble has a property called "mass", which effectively is
a measure of how hard it is to change its velocity by pushing on it.
But whatever mass ultimately is, you know that each marble hass mass.
So by having a certain density of marbles per volume of space -a
marble density- you also have a mass density.

   Let's say that each marble has a mass of 1 ounce. (Abbreviated 1
oz.) One marble constrained within the box gives the box a mass
density of 1 oz/ft^3. 10 marbles = 10 oz and the volume has a mass
density of 10 oz/ft^3.

   But whatever the amount of mass and the amount of volume, to get
mass density all you need do is divide mass (m) by volume (v): m/v.

   And it's the same in any system of units. The units in your problem
are grams (mass) and centimeters (distance), with volume being c^3.
Given mass = 615 grams, and volume = 105 cm^3, what then is the mass
density? It is 615/105 ~ 5.86 g/cm^3.