Bake a single cube from three wax cubes with edges of [[$ 3 $]] cm, [[$ 4 $]] cm and [[$ 5 $]] cm. Calculate the length of the edge of this cube. By what percentage does the total area change? (Finnish matriculation exam spring 1994)

Take a picture of your solution and submit it to the folder.

Answer: The length of the edge of the cube is cm.

The total area decreases increases by [[$ \% $]].