Answer: 
80 blocks 
Step-by-step explanation: 
Todd's tower measures 1 cm by 1 cm by 10 cm. The total number of blocks in the tower is ten and the volume of each is 

Now Aaron's block is twice as wide, twice as long, and twice as tall; therefore, its measurements are 
wisth = 1 cm x 2 = 2 cm 
length = 1 cm x 2 = 2 cm 
height = 10 cm x 2 = 20 cm 
Therefore, the volume of Aaron's block is 

Now how many blocks fit into 80 cubic cm? 
The volume of one block is 1 cubic centimetre, therefore, it takes 

blocks to make Aaron's tower.