Yvonne and Janna were writing their 1000-word pair research paper. Yvonne was able to write 400 words while Janna wrote 150 more words than Yvonne. When they edited their paper, they removed 20 words and added twice as many words as they removed. How many more words should they add to reach the research paper requirement?
Janna wrote 400 + 150 = 
<gadget id="calculator">400+150</gadget>
<output>550</output>
550 words.
Together, they wrote 400 + 550 = 
<gadget id="calculator">400+550</gadget>
<output>950</output>
950 words.
They have 950 - 20 = 
<gadget id="calculator">950-20</gadget>
<output>930</output>
930 words left after omitting 20 words.
Then 20 x 2 = 
<gadget id="calculator">20*2</gadget>
<output>40</output>
40 words were added during the editing.
Overall, they have 930 + 40 = 
<gadget id="calculator">930+40</gadget>
<output>970</output>
970 words.
Thus, they should add 1000 - 970 = 
<gadget id="calculator">1000-970</gadget>
<output>30</output>
30 more words.

<result>30</result>