Let's name all the purchases "x"
so

of them were stuffed animals, and out of that

were bears.
to get the results we have to multiply the fraction of bears by the fraction of the stuff animals:

.
and now we simplify:

=

and this is the answer!
Answer:
His sister is 3 years old.
Step-by-step explanation:
Micah - M
Sister - S
M = 3 + 5S
18 = 3 + 5S
15 = 5S
3 = S
His sister is 3.
So find the volume of the separate shapes. For rectangular prisms (which includes cubes), multiply width by height by length. So multiply 4 by 6 by 2. And for the cube, multiply 2 by 2 by 2. Then, to find the total volume, add the two together.
Your answer is D, you just have to complete the square.