Answer: 9
Explanation:
Given: All of Fernando's plays have 9 acts and all of Damon's plays have 3 acts.
The smallest number of acts each must have written = Least common multiple of 9 and 3
Since 9= 3 x 3
3 = 3 x 1
LCM(3,9) = 3 x 3 = 9
Hence, the smallest number of acts each must have written = 9