David collected 13 newspaper
<em><u>Solution:</u></em>
Given that,
Michelle collected 7 more than twice the number of newspaper David collected.
Michelle collected 33 newspaper
<em><u>To find: Number of newspaper collected by David</u></em>
From given information,
Number of newspaper collected by Michelle = 7 more than twice the number of newspaper David collected
Number of newspaper collected by Michelle = 7 + 2(Number of newspaper collected by David)
33 = 7 + 2(Number of newspaper collected by David)
2(Number of newspaper collected by David) = 33 - 7
2(Number of newspaper collected by David) = 26
Number of newspaper collected by David = 
Therefore David collected 13 newspaper