Answer:
280
Explanation:
Not entirely sure what 3 in means, but if we were to multiply the lenght*witdth*height we would get 56 since 8 x 3.5 x 2 =56, if we then multiplied one block by 5 we would get 280. this tower would have a height of 10 inches, a length of 8 inches, and a width of 3.5