To find the density of the toy, we first need to calculate its volume and then use the formula for density.
- Volume of the rectangular pyramid: The volume \( V \) of a rectangular pyramid can be calculated using the formula:
\[ V = \frac{1}{3} \times \text{Base Area} \times \text{Height} \]
where the Base Area is calculated as:
\[ \text{Base Area} = \text{Length} \times \text{Width} = 4 , \text{cm} \times 5 , \text{cm} = 20 , \text{cm}^2 \]
Now, substituting the Base Area and the height into the volume formula:
\[ V = \frac{1}{3} \times 20 , \text{cm}^2 \times 6 , \text{cm} = \frac{1}{3} \times 120 , \text{cm}^3 = 40 , \text{cm}^3 \]
- Density calculation: Density \( \rho \) is defined as mass divided by volume:
\[ \rho = \frac{\text{mass}}{\text{volume}} = \frac{25 , \text{grams}}{40 , \text{cm}^3} \]
Calculating the density:
\[ \rho = \frac{25}{40} = 0.625 , \text{g/cm}^3 \]
Therefore, the density of the toy is \( \boxed{0.625} , \text{g/cm}^3 \).