# Aliah has a plastic toy that weighs 40g. What else does she need to know in order to calculate the density of this toy?

##### 3 Answers

Well, she needs to know the volume....

#### Explanation:

By definition...

i.e.

Now if the toy floats on water then we know that

And if the toy sinks...

The volume

#### Explanation:

Given the mass of the toy is

calculate the density of the toy.

The formula for the density of a substance is

40g is the mass of the toy because it denotes the weight of the object.

The volume of the plastic toy is still needed to calculate the density.