I think it would require 100 workers since 1 worker digs up 1 yard.
Hope this helps.
Answer:

Step-by-step explanation:

convert mixed fraction into improper fraction.

calculate the sum of the fraction:

Answer:
3003 units^3.
Step-by-step explanation:
Just multiply the dimensions :
11 * 13 * 21
= 143 * 21
= 3003 units^3.
Im sorry, it is too blurry. I cannot read it.