Final answer:
Millie has a total of 48 meters of wire, which is the sum of 27 meters of brown wire and 21 meters of blue wire.
Step-by-step explanation:
To determine the total amount of wire Millie has, we should add the length of the brown wire to the length of the blue wire. Millie has 27 meters of brown wire and 21 meters of blue wire.
By performing the addition of these two lengths:
27 meters (brown wire) + 21 meters (blue wire) = 48 meters
So, Millie has a total of 48 meters of wire.