Answer:
740 words.
Explanation:
We will solve this problem with unitary method.
∵ Bart can type the number of words in 8 minutes = 296
∴ Bart can type the number of words in 1 minute = 

∴ Bart can type the number of words in 20 minutes = 

 = 

 = 

 = 740 words
Bart can type 740 words in 20 minutes.