So, Angela can type 1200 words in half an hour.To find out how many words Angela can type in 30 minutes (half an hour), we need to:First, find out how many words she types in 1 minute:Angela types 20 words in 3 minutes.120 words ÷ 3 minutes = 40 words per minute.Next, multiply the number of words she types in 1 minute by 30 (since there are 30 minutes in half an hour):40 words per minute × 30 minutes = 1200 words.