Answer:
7/20m
Explanation:
Ok so 3/4 is equal to 15/20.
Then you subtract the 3/20 from the 15/20 to get 12/20.
Then you multiply 3/20 by 5/3 to get 5/20 or 1/4.
Then you subtract 5/20 from 12/20 to get 7/20.
7/20 of a meter was the length of the 3rd piece.